diff --git a/include/bg.h b/include/bg.h
index 05a8aa48b..99352c574 100644
--- a/include/bg.h
+++ b/include/bg.h
@@ -1,6 +1,15 @@
 #ifndef GUARD_BG_H
 #define GUARD_BG_H
 
+enum
+{
+    BG0,
+    BG1,
+    BG2,
+    BG3,
+    NUM_BGS
+};
+
 struct BGControlStruct
 {
     u16 padding;
@@ -9,6 +18,11 @@ struct BGControlStruct
     s16 vofs;
 };
 
+extern struct BGControlStruct gBG0Control;
+extern struct BGControlStruct gBG1Control;
+extern struct BGControlStruct gBG2Control;
+extern struct BGControlStruct gBG3Control;
+
 void SetBG0RegOffsets(s32 xoffset, s32 yoffset);
 void SetBG1RegOffsets(s32 xoffset, s32 yoffset);
 void SetBG2RegOffsets(s32 xoffset, s32 yoffset);
diff --git a/include/music.h b/include/music.h
index 753fa045d..df7230d07 100644
--- a/include/music.h
+++ b/include/music.h
@@ -1,6 +1,15 @@
 #ifndef GUARD_MUSIC_H
 #define GUARD_MUSIC_H
 
+// PMD keeps it's own copy of music players for some reason
+struct PMDMusicPlayer
+{
+    u16 unk0;
+    u16 songIndex;
+    u16 volume;
+    bool8 isNotMaxVolume;
+};
+
 void StopBGMusicVSync(void);
 void StartBGMusicVSync(void);
 bool8 IsValidSong(u32 songIndex);
@@ -22,6 +31,9 @@ void FadeOutFanfareSE(u16 songIndex, u16 speed);
 bool8 IsFanfareSEPlaying(u16 songIndex);
 void SoundBiasReset(void);
 void SoundBiasSet(void);
+void UpdateSound(void);
+void SoundVSync(void);
+void nullsub_18(void);
 
 void nullsub_19(void);
 void nullsub_20(u16 songIndex);
diff --git a/ld_script.txt b/ld_script.txt
index ea1261c46..7a93d4038 100755
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -76,8 +76,10 @@ SECTIONS {
         src/file_system.o(.text);
         src/main.o(.text);
         asm/code_800B5F0.o(.text);
+        src/code_800B5F0.o(.text);
         src/music.o(.text);
         src/code_800C9CC.o(.text);
+        src/bg_control.o(.text);
         src/cpu.o(.text);
         src/flash.o(.text);
         src/code_800D090.o(.text);
diff --git a/src/bg_control.c b/src/bg_control.c
new file mode 100644
index 000000000..31f949cb4
--- /dev/null
+++ b/src/bg_control.c
@@ -0,0 +1,125 @@
+#include "global.h"
+#include "input.h"
+#include "bg.h"
+
+EWRAM_DATA struct BGControlStruct gBG0Control;
+EWRAM_DATA struct BGControlStruct gBG1Control;
+EWRAM_DATA struct BGControlStruct gBG2Control;
+EWRAM_DATA struct BGControlStruct gBG3Control;
+
+EWRAM_DATA u8 gBldAlpha_CoeffA;
+EWRAM_DATA u8 gBldAlpha_CoeffB;
+EWRAM_DATA u16 gBldAlpha;
+EWRAM_DATA u16 gBldCnt;
+EWRAM_DATA u8 gUnknown_202D7FE;
+
+void SetBldAlphaReg(s32 lowAlpha, s32 highAlpha)
+{
+    if(lowAlpha < 0)
+    {
+        lowAlpha = 0;
+    }
+    else if(lowAlpha > 16)
+    {
+        lowAlpha = 16;
+    }
+
+    if(highAlpha < 0)
+    {
+        highAlpha = 0;
+    }
+    else if(highAlpha > 16)
+    {
+        highAlpha = 16;
+    }
+
+    gBldAlpha_CoeffA = lowAlpha;
+    gBldAlpha_CoeffB = highAlpha;
+
+    gBldAlpha = BLDALPHA_BLEND1(gBldAlpha_CoeffA, gBldAlpha_CoeffB);
+}
+
+void SetBG0RegOffsets(s32 xoffset, s32 yoffset)
+{
+    gBG0Control.hofs = xoffset;
+    gBG0Control.vofs = yoffset;
+}
+
+void SetBG1RegOffsets(s32 xoffset, s32 yoffset)
+{
+    gBG1Control.hofs = xoffset;
+    gBG1Control.vofs = yoffset;
+}
+
+void SetBG2RegOffsets(s32 xoffset, s32 yoffset)
+{
+    gBG2Control.hofs = xoffset;
+    gBG2Control.vofs = yoffset;
+}
+
+void SetBG3RegOffsets(s32 xoffset, s32 yoffset)
+{
+    gBG3Control.hofs = xoffset;
+    gBG3Control.vofs = yoffset;
+}
+
+void SetBGRegOffsets(s32 reg, u32 xoffset, s32 yoffset)
+{
+    switch (reg) {
+        default:
+        case 0: return SetBG0RegOffsets(xoffset, yoffset);
+        case 1: return SetBG1RegOffsets(xoffset, yoffset);
+        case 2: return SetBG2RegOffsets(xoffset, yoffset);
+        case 3: return SetBG3RegOffsets(xoffset, yoffset);
+    }
+}
+
+void SetBGRegXOffset(s32 reg, s32 offset)
+{
+    switch (reg) {
+        default:
+        case 0:
+            gBG0Control.hofs = offset;
+            break;
+        case 1:
+            gBG1Control.hofs = offset;
+            break;
+        case 2:
+            gBG2Control.hofs = offset;
+            break;
+        case 3:
+            gBG3Control.hofs = offset;
+            break;
+    }
+}
+
+void SetBGRegYOffset(s32 reg, s32 offset)
+{
+    switch (reg) {
+        default:
+        case 0:
+            gBG0Control.vofs = offset;
+            break;
+        case 1:
+            gBG1Control.vofs = offset;
+            break;
+        case 2:
+            gBG2Control.vofs = offset;
+            break;
+        case 3:
+            gBG3Control.vofs = offset;
+            break;
+    }
+}
+
+void sub_800CD64(s32 r0, u8 r1)
+{
+    gUnknown_202D7FE = r1;
+    gBG2Control.unk2 = r0 ? 0x8000 : 0; 
+}
+
+void SetBGOBJEnableFlags(u32 mask)
+{
+    REG_DISPCNT = (REG_DISPCNT & 0xe0ff) | (~(mask << 8) & (DISPCNT_BG_ALL_ON | DISPCNT_OBJ_ON));
+}
+
diff --git a/src/code_800B5F0.c b/src/code_800B5F0.c
new file mode 100644
index 000000000..87dc95d11
--- /dev/null
+++ b/src/code_800B5F0.c
@@ -0,0 +1,348 @@
+#include "global.h"
+#include "bg.h"
+#include "input.h"
+#include "music.h"
+#include "debug.h"
+
+typedef void (*IntrCallback)(void);
+extern IntrCallback gIntrCallbacks[];
+
+struct unkStruct_202D648
+{
+    s16 unk0;
+    s16 unk2; // Vcount??
+    IntrCallback unk4; // some function... just making it IntrCallback for now
+};
+extern struct unkStruct_202D648 gUnknown_202D648[8];
+extern struct unkStruct_202D648 gUnknown_202D608[8];
+
+extern u8 gUnknown_202D7FE;
+extern u16 gBldCnt;
+
+EWRAM_DATA u8 gUnknown_203B099;
+EWRAM_DATA u8 gUnknown_203B09A;
+EWRAM_DATA u8 gUnknown_203B09B;
+EWRAM_DATA u32 gUnknown_203B09C;
+EWRAM_DATA u32 gUnknown_203B0A0;
+EWRAM_DATA u32 gUnknown_203B0A4;
+EWRAM_DATA u32 gUnknown_203B0A8;
+EWRAM_DATA s16 gUnknown_203B0AA;
+EWRAM_DATA s16 gUnknown_203B0AC;
+EWRAM_DATA s16 gUnknown_203B0AE;
+EWRAM_DATA s16 gUnknown_203B0B0;
+EWRAM_DATA s16 gUnknown_203B0B2;
+
+extern bool8 EnableInterrupts(void);
+extern bool8 DisableInterrupts(void);
+void xxx_update_bg_sound_input();
+extern void AckInterrupt(u16);
+void BlinkSavingIcon();
+
+void UnusedIntrFunc(void)
+{
+}
+
+void VBlankIntr(void)
+{
+    int index;
+
+    gUnknown_203B0A0++;
+    SoundVSync();
+    BlinkSavingIcon();
+    if (gIntrCallbacks[1] != NULL) {
+        gIntrCallbacks[1]();
+    }
+    for(index = 0; index < gUnknown_203B0AA; index++) {
+        gUnknown_202D648[index] = gUnknown_202D608[index];
+    }
+    gUnknown_203B0AC = gUnknown_203B0AA;
+    gUnknown_203B0AE = -1;
+    gUnknown_203B0B0 = -1;
+    gUnknown_203B0B2 = -1;
+    REG_DISPSTAT = DISPSTAT_VBLANK_INTR | DISPSTAT_VCOUNT_INTR;
+    if (gUnknown_203B099 == 0) {
+        UpdateSound();
+    }
+    AckInterrupt(INTR_FLAG_VBLANK);
+}
+
+// Registers are a little off.. seems to be around the while loop
+#ifdef NONMATCHING
+void VCountIntr(void)
+{
+  s32 sVar1;
+  s32 sVar2;
+  
+  // Hack to get the lsr/asr shifts
+  sVar2 = REG_VCOUNT << 16;
+  sVar2 = sVar2 >> 16;
+
+  if (gUnknown_203B0AE < 0) {
+    if (gIntrCallbacks[2] != 0) {
+      gIntrCallbacks[2]();
+    }
+    gUnknown_203B0AE = 0;
+  }
+  if (gUnknown_203B0AE < gUnknown_203B0AC) {
+    sVar1 = gUnknown_202D648[gUnknown_203B0AE].unk2;
+    while (sVar1 <= sVar2) {
+      if ( gUnknown_202D648[gUnknown_203B0AE].unk4 != NULL) {
+        gUnknown_202D648[gUnknown_203B0AE].unk4();
+      }
+      gUnknown_203B0AE++;
+      if (gUnknown_203B0AC >= gUnknown_203B0AE) break;
+      sVar1 = gUnknown_202D648[gUnknown_203B0AE].unk2;
+    }
+    if (gUnknown_203B0AE < gUnknown_203B0AC) {
+      REG_DISPSTAT = gUnknown_202D648[gUnknown_203B0AE].unk2 << 8 | DISPSTAT_VBLANK_INTR | DISPSTAT_VCOUNT_INTR;
+    }
+  }
+  AckInterrupt(INTR_FLAG_VCOUNT);
+}
+#else
+NAKED
+void VCountIntr(void)
+{
+    asm_unified(
+	"\tpush {r4-r7,lr}\n"
+	"\tmov r7, r8\n"
+	"\tpush {r7}\n"
+	"\tldr r0, _0800BA44\n"
+	"\tldrh r0, [r0]\n"
+	"\tlsls r0, 16\n"
+	"\tasrs r6, r0, 16\n"
+	"\tldr r0, _0800BA48\n"
+	"\tmovs r2, 0\n"
+	"\tldrsh r1, [r0, r2]\n"
+	"\tadds r7, r0, 0\n"
+	"\tcmp r1, 0\n"
+	"\tbge _0800B9B2\n"
+	"\tldr r0, _0800BA4C\n"
+	"\tldr r0, [r0, 0x8]\n"
+	"\tcmp r0, 0\n"
+	"\tbeq _0800B9AE\n"
+	"\tbl _call_via_r0\n"
+"_0800B9AE:\n"
+	"\tmovs r0, 0\n"
+	"\tstrh r0, [r7]\n"
+"_0800B9B2:\n"
+	"\tldr r0, _0800BA50\n"
+	"\tmovs r3, 0\n"
+	"\tldrsh r2, [r7, r3]\n"
+	"\tmovs r3, 0\n"
+	"\tldrsh r1, [r0, r3]\n"
+	"\tmov r8, r0\n"
+	"\tcmp r2, r1\n"
+	"\tbge _0800BA34\n"
+	"\tldr r1, _0800BA54\n"
+	"\tadds r0, r2, 0\n"
+	"\tlsls r0, 3\n"
+	"\tadds r0, r1\n"
+	"\tmovs r3, 0x2\n"
+	"\tldrsh r0, [r0, r3]\n"
+	"\tcmp r0, r6\n"
+	"\tbgt _0800BA10\n"
+	"\tadds r5, r1, 0\n"
+	"\tadds r4, r7, 0\n"
+"_0800B9D6:\n"
+	"\tmovs r1, 0\n"
+	"\tldrsh r0, [r4, r1]\n"
+	"\tlsls r0, 3\n"
+	"\tadds r1, r5, 0x4\n"
+	"\tadds r0, r1\n"
+	"\tldr r0, [r0]\n"
+	"\tcmp r0, 0\n"
+	"\tbeq _0800B9EA\n"
+	"\tbl _call_via_r0\n"
+"_0800B9EA:\n"
+	"\tldrh r0, [r4]\n"
+	"\tadds r0, 0x1\n"
+	"\tstrh r0, [r4]\n"
+	"\tldr r1, _0800BA50\n"
+	"\tlsls r0, 16\n"
+	"\tasrs r0, 16\n"
+	"\tmovs r2, 0\n"
+	"\tldrsh r1, [r1, r2]\n"
+	"\tcmp r0, r1\n"
+	"\tbge _0800BA34\n"
+	"\tmovs r3, 0\n"
+	"\tldrsh r0, [r4, r3]\n"
+	"\tlsls r0, 3\n"
+	"\tadds r0, r5\n"
+	"\tmovs r1, 0x2\n"
+	"\tldrsh r0, [r0, r1]\n"
+	"\tldr r7, _0800BA48\n"
+	"\tcmp r0, r6\n"
+	"\tble _0800B9D6\n"
+"_0800BA10:\n"
+	"\tmovs r2, 0\n"
+	"\tldrsh r1, [r7, r2]\n"
+	"\tmov r3, r8\n"
+	"\tmovs r2, 0\n"
+	"\tldrsh r0, [r3, r2]\n"
+	"\tcmp r1, r0\n"
+	"\tbge _0800BA34\n"
+	"\tldr r2, _0800BA58\n"
+	"\tldr r1, _0800BA54\n"
+	"\tmovs r3, 0\n"
+	"\tldrsh r0, [r7, r3]\n"
+	"\tlsls r0, 3\n"
+	"\tadds r0, r1\n"
+	"\tldrh r0, [r0, 0x2]\n"
+	"\tlsls r0, 8\n"
+	"\tmovs r1, 0x28\n"
+	"\torrs r0, r1\n"
+	"\tstrh r0, [r2]\n"
+"_0800BA34:\n"
+	"\tmovs r0, 0x4\n"
+	"\tbl AckInterrupt\n"
+	"\tpop {r3}\n"
+	"\tmov r8, r3\n"
+	"\tpop {r4-r7}\n"
+	"\tpop {r0}\n"
+	"\tbx r0\n"
+	"\t.align 2, 0\n"
+"_0800BA44: .4byte 0x04000006\n"
+"_0800BA48: .4byte gUnknown_203B0AE\n"
+"_0800BA4C: .4byte gIntrCallbacks\n"
+"_0800BA50: .4byte gUnknown_203B0AC\n"
+"_0800BA54: .4byte gUnknown_202D648\n"
+"_0800BA58: .4byte 0x04000004"
+    );
+}
+#endif
+
+void sub_800BA5C(void)
+{
+    if(gUnknown_203B09A != 0)
+    {
+        gUnknown_203B09C++;
+        xxx_update_bg_sound_input();
+    }
+    gUnknown_203B09A = 1;
+    gUnknown_203B09B = 0;
+    gUnknown_203B09C = 0;
+    nullsub_25();
+
+    while(REG_VCOUNT > 159){}
+
+    gUnknown_203B099 = 1;
+    VBlankIntrWait();
+    nullsub_18();
+}
+
+void xxx_update_bg_sound_input(void)
+{
+    if(gUnknown_203B09B != 0){
+        gUnknown_203B09C++;
+    }
+    else {
+        gUnknown_203B09B = 1;
+        gUnknown_203B09A = 0;
+        gUnknown_203B09C = 0;
+        UpdateBGControlRegisters();
+        if(gUnknown_203B099 != 0)
+            UpdateSound();
+        UpdateInput();
+        gUnknown_203B099 = 0;
+        gUnknown_203B0A4 = gUnknown_203B0A0;
+    }
+}
+
+void Timer3Intr(void)
+{
+    if(gIntrCallbacks[4])
+        gIntrCallbacks[4]();
+    AckInterrupt(INTR_FLAG_TIMER3);
+}
+
+// Unused
+u32 sub_800BB34(void)
+{
+    return gUnknown_203B0A0;
+}
+
+void nullsub_178(void)
+{
+}
+
+// Unused
+void sub_800BB44(void)
+{
+    u16 ie_store;
+    u16 dispcnt_store;
+    bool8 interrupt_flag;
+
+    while(REG_KEYINPUT != KEYS_MASK){}
+
+    interrupt_flag = DisableInterrupts();
+
+    while(REG_VCOUNT < 160){}
+
+    dispcnt_store = REG_DISPCNT;
+    REG_DISPCNT = DISPCNT_FORCED_BLANK;
+
+    *(vu16 *)BG_PLTT = RGB_WHITE;
+
+    ie_store = REG_IE;
+    REG_IE = INTR_FLAG_KEYPAD | INTR_FLAG_GAMEPAK;
+
+    REG_KEYCNT = KEY_AND_INTR | R_BUTTON | L_BUTTON | SELECT_BUTTON; // 0x8304
+    REG_IME = 1;
+
+    SoundBiasReset();
+    asm("swi 0x3");
+    SoundBiasSet();
+
+    REG_IME = 0;
+    REG_IE = ie_store;
+    REG_KEYCNT = 0;
+    REG_DISPCNT = dispcnt_store;
+    *(vu16 *)BG_PLTT = RGB_BLACK;
+
+    if(interrupt_flag)
+        EnableInterrupts();
+    while(REG_KEYINPUT != KEYS_MASK){}
+}
+
+void nullsub_17(void)
+{
+}
+
+void UpdateBGControlRegisters(void)
+{
+    u32 BGCNT_Priority[NUM_BGS];
+
+    if(gUnknown_202D7FE == 1)
+    {
+        BGCNT_Priority[BG0] = BGCNT_PRIORITY(1);
+        BGCNT_Priority[BG1] = BGCNT_PRIORITY(2);
+        BGCNT_Priority[BG2] = BGCNT_PRIORITY(0);
+        BGCNT_Priority[BG3] = BGCNT_PRIORITY(3);
+    }
+    else
+    {
+        BGCNT_Priority[BG0] = BGCNT_PRIORITY(0);
+        BGCNT_Priority[BG1] = BGCNT_PRIORITY(1);
+        BGCNT_Priority[BG2] = BGCNT_PRIORITY(2);
+        BGCNT_Priority[BG3] = BGCNT_PRIORITY(3);
+    }
+
+    REG_BG0HOFS = gBG0Control.hofs;
+    REG_BG0VOFS = gBG0Control.vofs;
+    REG_BG1HOFS = gBG1Control.hofs;
+    REG_BG1VOFS = gBG1Control.vofs;
+    REG_BG2HOFS = gBG2Control.hofs;
+    REG_BG2VOFS = gBG2Control.vofs;
+    REG_BG3HOFS = gBG3Control.hofs;
+    REG_BG3VOFS = gBG3Control.vofs;
+
+    REG_BG0CNT = BGCNT_Priority[BG0] | BGCNT_SCREENBASE(12) | BGCNT_CHARBASE(0) | BGCNT_WRAP; // 0x2C00
+    REG_BG1CNT = BGCNT_Priority[BG1] | BGCNT_SCREENBASE(13) | BGCNT_CHARBASE(0) | BGCNT_WRAP; // 0x2D00
+    if(gBG2Control.unk2 == 0x8000)
+        REG_BG2CNT = BGCNT_Priority[BG2] | BGCNT_SCREENBASE(14) | BGCNT_CHARBASE(2) | BGCNT_WRAP; // 0x2E08
+    else
+        REG_BG2CNT = BGCNT_Priority[BG2] | BGCNT_SCREENBASE(14) | BGCNT_CHARBASE(0) | BGCNT_WRAP; // 0x2E00
+    REG_BG3CNT = BGCNT_Priority[BG3] | BGCNT_SCREENBASE(15) | BGCNT_CHARBASE(2) | BGCNT_WRAP;
+    REG_BLDCNT = gBldCnt;
+}
diff --git a/src/code_800C9CC.c b/src/code_800C9CC.c
index 20d54e7d1..17a45b714 100644
--- a/src/code_800C9CC.c
+++ b/src/code_800C9CC.c
@@ -1,19 +1,47 @@
 #include "global.h"
 #include "input.h"
-#include "bg.h"
+#include "random.h"
+
+void sub_800BA5C();
+void xxx_update_bg_sound_input();
 
 extern u16 gRawKeyInput;
+extern u32 gUnknown_203B0B8;
 
-extern struct BGControlStruct gBG0Control;
-extern struct BGControlStruct gBG1Control;
-extern struct BGControlStruct gBG2Control;
-extern struct BGControlStruct gBG3Control;
+void sub_800CB20(void)
+{
+    sub_800BA5C();
+    gUnknown_203B0B8++;
+    if((gRawKeyInput & (A_BUTTON | SELECT_BUTTON)) != 0)
+    {
+        Rand32Bit();
+    }
+    Rand32Bit();
+}
 
-extern u8 gBldAlpha_CoeffA;
-extern u8 gBldAlpha_CoeffB;
-extern u16 gBldAlpha;
-extern u8 gUnknown_202D7FE;
+// Unused
+u32 sub_800CB50(void)
+{
+    return gUnknown_203B0B8;
+}
 
+void nullsub_180(void)
+{
+}
+
+void xxx_call_update_bg_sound_input(void)
+{
+    xxx_update_bg_sound_input();
+}
+
+void nullsub_181(void)
+{
+}
+
+u32 sub_800CB70(void)
+{
+    return 0;
+}
 
 void ReadKeyInput(struct Inputs *r0)
 {
@@ -53,112 +81,3 @@ void ReadKeyInput(struct Inputs *r0)
     gRawKeyInput = keyInput;
 }
 
-void SetBldAlphaReg(s32 lowAlpha, s32 highAlpha)
-{
-    if(lowAlpha < 0)
-    {
-        lowAlpha = 0;
-    }
-    else if(lowAlpha > 16)
-    {
-        lowAlpha = 16;
-    }
-
-    if(highAlpha < 0)
-    {
-        highAlpha = 0;
-    }
-    else if(highAlpha > 16)
-    {
-        highAlpha = 16;
-    }
-
-    gBldAlpha_CoeffA = lowAlpha;
-    gBldAlpha_CoeffB = highAlpha;
-
-    gBldAlpha = BLDALPHA_BLEND1(gBldAlpha_CoeffA, gBldAlpha_CoeffB);
-}
-
-void SetBG0RegOffsets(s32 xoffset, s32 yoffset)
-{
-    gBG0Control.hofs = xoffset;
-    gBG0Control.vofs = yoffset;
-}
-
-void SetBG1RegOffsets(s32 xoffset, s32 yoffset)
-{
-    gBG1Control.hofs = xoffset;
-    gBG1Control.vofs = yoffset;
-}
-
-void SetBG2RegOffsets(s32 xoffset, s32 yoffset)
-{
-    gBG2Control.hofs = xoffset;
-    gBG2Control.vofs = yoffset;
-}
-
-void SetBG3RegOffsets(s32 xoffset, s32 yoffset)
-{
-    gBG3Control.hofs = xoffset;
-    gBG3Control.vofs = yoffset;
-}
-
-void SetBGRegOffsets(s32 reg, u32 xoffset, s32 yoffset)
-{
-    switch (reg) {
-        default:
-        case 0: return SetBG0RegOffsets(xoffset, yoffset);
-        case 1: return SetBG1RegOffsets(xoffset, yoffset);
-        case 2: return SetBG2RegOffsets(xoffset, yoffset);
-        case 3: return SetBG3RegOffsets(xoffset, yoffset);
-    }
-}
-
-void SetBGRegXOffset(s32 reg, s32 offset)
-{
-    switch (reg) {
-        default:
-        case 0:
-            gBG0Control.hofs = offset;
-            break;
-        case 1:
-            gBG1Control.hofs = offset;
-            break;
-        case 2:
-            gBG2Control.hofs = offset;
-            break;
-        case 3:
-            gBG3Control.hofs = offset;
-            break;
-    }
-}
-
-void SetBGRegYOffset(s32 reg, s32 offset)
-{
-    switch (reg) {
-        default:
-        case 0:
-            gBG0Control.vofs = offset;
-            break;
-        case 1:
-            gBG1Control.vofs = offset;
-            break;
-        case 2:
-            gBG2Control.vofs = offset;
-            break;
-        case 3:
-            gBG3Control.vofs = offset;
-            break;
-    }
-}
-
-void sub_800CD64(s32 r0, u8 r1)
-{
-    gUnknown_202D7FE = r1;
-    gBG2Control.unk2 = r0 ? 0x8000 : 0; 
-}
-
-void SetBGOBJEnableFlags(u32 mask)
-{
-    REG_DISPCNT = (REG_DISPCNT & 0xe0ff) | (~(mask << 8) & (DISPCNT_BG_ALL_ON | DISPCNT_OBJ_ON));
-}
diff --git a/src/flash.c b/src/flash.c
index 934d07173..0ef93e7c6 100644
--- a/src/flash.c
+++ b/src/flash.c
@@ -3,7 +3,7 @@
 #include "flash.h"
 #include "memory.h"
 
-extern u8 gFlashEnabled;
+EWRAM_DATA u8 gFlashEnabled;
 
 extern FlashIntrFunc *GetInterruptHandler(s32);
 
diff --git a/src/music.c b/src/music.c
index 469de1325..394052eaa 100644
--- a/src/music.c
+++ b/src/music.c
@@ -1,396 +1,23 @@
 #include "global.h"
-#include "gba/io_reg.h"
 #include "m4a.h"
-#include "bg.h"
 #include "music.h"
-#include "input.h"
 #include "constants/bg_music.h"
-#include "random.h"
 
-extern bool8 EnableInterrupts(void);
-extern bool8 DisableInterrupts(void);
-extern void AckInterrupt(u16);
-extern void nullsub_25(void);
-
-void nullsub_18(void);
-void UpdateSound(void);
-void nullsub_21(u16);
-void sub_800BA5C();
-void xxx_update_bg_sound_input();
-void SoundVSync();
-void BlinkSavingIcon();
-
-typedef void (*IntrCallback)(void);
-extern IntrCallback gIntrCallbacks[];
-
-struct unkStruct_202D648
-{
-    s16 unk0;
-    s16 unk2; // Vcount??
-    IntrCallback unk4; // some function... just making it IntrCallback for now
-};
-extern struct unkStruct_202D648 gUnknown_202D648[8];
-extern struct unkStruct_202D648 gUnknown_202D608[8];
+EWRAM_DATA u16 gBGMusicPlayerState;
+EWRAM_DATA u16 gCurrentBGSong;
+EWRAM_DATA u16 gQueuedBGSong;
+EWRAM_DATA u16 gCurrentFanfareSong;
+EWRAM_DATA u16 gFanfareMusicPlayerState;
+EWRAM_DATA u16 gMusicTransitionCounter;
+EWRAM_DATA bool8 gRestartBGM;
 
 extern struct MusicPlayerInfo gMPlayInfo_BGM; // BGM??
-extern u32 gUnknown_203B0A4;
-extern u16 gBGMusicPlayerState;
-extern u16 gCurrentBGSong;
-extern u16 gQueuedBGSong;
-extern u16 gCurrentFanfareSong;
-extern u16 gFanfareMusicPlayerState;
-extern u16 gMusicTransitionCounter;
-extern bool8 gRestartBGM;
-extern u8 gUnknown_203B099;
-extern u8 gUnknown_203B09B;
-extern u32 gUnknown_203B09C;
-extern u8 gUnknown_203B09A;
-extern u32 gUnknown_203B0B8;
-extern u16 gRawKeyInput;
-
-extern u32 gUnknown_203B0A0;
-extern s16 gUnknown_203B0AA;
-extern s16 gUnknown_203B0AC;
-extern s16 gUnknown_203B0AE;
-extern s16 gUnknown_203B0B0;
-extern s16 gUnknown_203B0B2;
-
-// PMD keeps it's own copy of music players for some reason
-struct PMDMusicPlayer
-{
-    u16 unk0;
-    u16 songIndex;
-    u16 volume;
-    bool8 isNotMaxVolume;
-};
-
 extern struct PMDMusicPlayer gUnknown_3000FD8[8];
 extern struct PMDMusicPlayer gUnknown_3000FE8[8];
 
-extern u8 gUnknown_202D7FE;
-extern u16 gBldCnt;
-extern struct BGControlStruct gBG0Control;
-extern struct BGControlStruct gBG1Control;
-extern struct BGControlStruct gBG2Control;
-extern struct BGControlStruct gBG3Control;
-
-enum
-{
-    BG0,
-    BG1,
-    BG2,
-    BG3,
-    NUM_BGS
-};
-
-void UnusedIntrFunc(void)
-{
-}
-
-void VBlankIntr(void)
-{
-    int index;
-
-    gUnknown_203B0A0++;
-    SoundVSync();
-    BlinkSavingIcon();
-    if (gIntrCallbacks[1] != NULL) {
-        gIntrCallbacks[1]();
-    }
-    for(index = 0; index < gUnknown_203B0AA; index++) {
-        gUnknown_202D648[index] = gUnknown_202D608[index];
-    }
-    gUnknown_203B0AC = gUnknown_203B0AA;
-    gUnknown_203B0AE = -1;
-    gUnknown_203B0B0 = -1;
-    gUnknown_203B0B2 = -1;
-    REG_DISPSTAT = DISPSTAT_VBLANK_INTR | DISPSTAT_VCOUNT_INTR;
-    if (gUnknown_203B099 == 0) {
-        UpdateSound();
-    }
-    AckInterrupt(INTR_FLAG_VBLANK);
-}
-
-// Registers are a little off.. seems to be around the while loop
-#ifdef NONMATCHING
-void VCountIntr(void)
-{
-  s32 sVar1;
-  s32 sVar2;
-  
-  // Hack to get the lsr/asr shifts
-  sVar2 = REG_VCOUNT << 16;
-  sVar2 = sVar2 >> 16;
-
-  if (gUnknown_203B0AE < 0) {
-    if (gIntrCallbacks[2] != 0) {
-      gIntrCallbacks[2]();
-    }
-    gUnknown_203B0AE = 0;
-  }
-  if (gUnknown_203B0AE < gUnknown_203B0AC) {
-    sVar1 = gUnknown_202D648[gUnknown_203B0AE].unk2;
-    while (sVar1 <= sVar2) {
-      if ( gUnknown_202D648[gUnknown_203B0AE].unk4 != NULL) {
-        gUnknown_202D648[gUnknown_203B0AE].unk4();
-      }
-      gUnknown_203B0AE++;
-      if (gUnknown_203B0AC >= gUnknown_203B0AE) break;
-      sVar1 = gUnknown_202D648[gUnknown_203B0AE].unk2;
-    }
-    if (gUnknown_203B0AE < gUnknown_203B0AC) {
-      REG_DISPSTAT = gUnknown_202D648[gUnknown_203B0AE].unk2 << 8 | DISPSTAT_VBLANK_INTR | DISPSTAT_VCOUNT_INTR;
-    }
-  }
-  AckInterrupt(INTR_FLAG_VCOUNT);
-}
-#else
-NAKED
-void VCountIntr(void)
-{
-    asm_unified(
-	"\tpush {r4-r7,lr}\n"
-	"\tmov r7, r8\n"
-	"\tpush {r7}\n"
-	"\tldr r0, _0800BA44\n"
-	"\tldrh r0, [r0]\n"
-	"\tlsls r0, 16\n"
-	"\tasrs r6, r0, 16\n"
-	"\tldr r0, _0800BA48\n"
-	"\tmovs r2, 0\n"
-	"\tldrsh r1, [r0, r2]\n"
-	"\tadds r7, r0, 0\n"
-	"\tcmp r1, 0\n"
-	"\tbge _0800B9B2\n"
-	"\tldr r0, _0800BA4C\n"
-	"\tldr r0, [r0, 0x8]\n"
-	"\tcmp r0, 0\n"
-	"\tbeq _0800B9AE\n"
-	"\tbl _call_via_r0\n"
-"_0800B9AE:\n"
-	"\tmovs r0, 0\n"
-	"\tstrh r0, [r7]\n"
-"_0800B9B2:\n"
-	"\tldr r0, _0800BA50\n"
-	"\tmovs r3, 0\n"
-	"\tldrsh r2, [r7, r3]\n"
-	"\tmovs r3, 0\n"
-	"\tldrsh r1, [r0, r3]\n"
-	"\tmov r8, r0\n"
-	"\tcmp r2, r1\n"
-	"\tbge _0800BA34\n"
-	"\tldr r1, _0800BA54\n"
-	"\tadds r0, r2, 0\n"
-	"\tlsls r0, 3\n"
-	"\tadds r0, r1\n"
-	"\tmovs r3, 0x2\n"
-	"\tldrsh r0, [r0, r3]\n"
-	"\tcmp r0, r6\n"
-	"\tbgt _0800BA10\n"
-	"\tadds r5, r1, 0\n"
-	"\tadds r4, r7, 0\n"
-"_0800B9D6:\n"
-	"\tmovs r1, 0\n"
-	"\tldrsh r0, [r4, r1]\n"
-	"\tlsls r0, 3\n"
-	"\tadds r1, r5, 0x4\n"
-	"\tadds r0, r1\n"
-	"\tldr r0, [r0]\n"
-	"\tcmp r0, 0\n"
-	"\tbeq _0800B9EA\n"
-	"\tbl _call_via_r0\n"
-"_0800B9EA:\n"
-	"\tldrh r0, [r4]\n"
-	"\tadds r0, 0x1\n"
-	"\tstrh r0, [r4]\n"
-	"\tldr r1, _0800BA50\n"
-	"\tlsls r0, 16\n"
-	"\tasrs r0, 16\n"
-	"\tmovs r2, 0\n"
-	"\tldrsh r1, [r1, r2]\n"
-	"\tcmp r0, r1\n"
-	"\tbge _0800BA34\n"
-	"\tmovs r3, 0\n"
-	"\tldrsh r0, [r4, r3]\n"
-	"\tlsls r0, 3\n"
-	"\tadds r0, r5\n"
-	"\tmovs r1, 0x2\n"
-	"\tldrsh r0, [r0, r1]\n"
-	"\tldr r7, _0800BA48\n"
-	"\tcmp r0, r6\n"
-	"\tble _0800B9D6\n"
-"_0800BA10:\n"
-	"\tmovs r2, 0\n"
-	"\tldrsh r1, [r7, r2]\n"
-	"\tmov r3, r8\n"
-	"\tmovs r2, 0\n"
-	"\tldrsh r0, [r3, r2]\n"
-	"\tcmp r1, r0\n"
-	"\tbge _0800BA34\n"
-	"\tldr r2, _0800BA58\n"
-	"\tldr r1, _0800BA54\n"
-	"\tmovs r3, 0\n"
-	"\tldrsh r0, [r7, r3]\n"
-	"\tlsls r0, 3\n"
-	"\tadds r0, r1\n"
-	"\tldrh r0, [r0, 0x2]\n"
-	"\tlsls r0, 8\n"
-	"\tmovs r1, 0x28\n"
-	"\torrs r0, r1\n"
-	"\tstrh r0, [r2]\n"
-"_0800BA34:\n"
-	"\tmovs r0, 0x4\n"
-	"\tbl AckInterrupt\n"
-	"\tpop {r3}\n"
-	"\tmov r8, r3\n"
-	"\tpop {r4-r7}\n"
-	"\tpop {r0}\n"
-	"\tbx r0\n"
-	"\t.align 2, 0\n"
-"_0800BA44: .4byte 0x04000006\n"
-"_0800BA48: .4byte gUnknown_203B0AE\n"
-"_0800BA4C: .4byte gIntrCallbacks\n"
-"_0800BA50: .4byte gUnknown_203B0AC\n"
-"_0800BA54: .4byte gUnknown_202D648\n"
-"_0800BA58: .4byte 0x04000004"
-    );
-}
-#endif
-
-void sub_800BA5C(void)
-{
-    if(gUnknown_203B09A != 0)
-    {
-        gUnknown_203B09C++;
-        xxx_update_bg_sound_input();
-    }
-    gUnknown_203B09A = 1;
-    gUnknown_203B09B = 0;
-    gUnknown_203B09C = 0;
-    nullsub_25();
-
-    while(REG_VCOUNT > 159){}
-
-    gUnknown_203B099 = 1;
-    VBlankIntrWait();
-    nullsub_18();
-}
-
-void xxx_update_bg_sound_input(void)
-{
-    if(gUnknown_203B09B != 0){
-        gUnknown_203B09C++;
-    }
-    else {
-        gUnknown_203B09B = 1;
-        gUnknown_203B09A = 0;
-        gUnknown_203B09C = 0;
-        UpdateBGControlRegisters();
-        if(gUnknown_203B099 != 0)
-            UpdateSound();
-        UpdateInput();
-        gUnknown_203B099 = 0;
-        gUnknown_203B0A4 = gUnknown_203B0A0;
-    }
-}
-
-void Timer3Intr(void)
-{
-    if(gIntrCallbacks[4])
-        gIntrCallbacks[4]();
-    AckInterrupt(INTR_FLAG_TIMER3);
-}
-
-// Unused
-u32 sub_800BB34(void)
-{
-    return gUnknown_203B0A0;
-}
-
-void nullsub_178(void)
-{
-}
-
-// Unused
-void sub_800BB44(void)
-{
-    u16 ie_store;
-    u16 dispcnt_store;
-    bool8 interrupt_flag;
-
-    while(REG_KEYINPUT != KEYS_MASK){}
-
-    interrupt_flag = DisableInterrupts();
-
-    while(REG_VCOUNT < 160){}
-
-    dispcnt_store = REG_DISPCNT;
-    REG_DISPCNT = DISPCNT_FORCED_BLANK;
-
-    *(vu16 *)BG_PLTT = RGB_WHITE;
-
-    ie_store = REG_IE;
-    REG_IE = INTR_FLAG_KEYPAD | INTR_FLAG_GAMEPAK;
-
-    REG_KEYCNT = KEY_AND_INTR | R_BUTTON | L_BUTTON | SELECT_BUTTON; // 0x8304
-    REG_IME = 1;
-
-    SoundBiasReset();
-    asm("swi 0x3");
-    SoundBiasSet();
-
-    REG_IME = 0;
-    REG_IE = ie_store;
-    REG_KEYCNT = 0;
-    REG_DISPCNT = dispcnt_store;
-    *(vu16 *)BG_PLTT = RGB_BLACK;
-
-    if(interrupt_flag)
-        EnableInterrupts();
-    while(REG_KEYINPUT != KEYS_MASK){}
-}
-
-void nullsub_17(void)
-{
-}
-
-void UpdateBGControlRegisters(void)
-{
-    u32 BGCNT_Priority[NUM_BGS];
-
-    if(gUnknown_202D7FE == 1)
-    {
-        BGCNT_Priority[BG0] = BGCNT_PRIORITY(1);
-        BGCNT_Priority[BG1] = BGCNT_PRIORITY(2);
-        BGCNT_Priority[BG2] = BGCNT_PRIORITY(0);
-        BGCNT_Priority[BG3] = BGCNT_PRIORITY(3);
-    }
-    else
-    {
-        BGCNT_Priority[BG0] = BGCNT_PRIORITY(0);
-        BGCNT_Priority[BG1] = BGCNT_PRIORITY(1);
-        BGCNT_Priority[BG2] = BGCNT_PRIORITY(2);
-        BGCNT_Priority[BG3] = BGCNT_PRIORITY(3);
-    }
-
-    REG_BG0HOFS = gBG0Control.hofs;
-    REG_BG0VOFS = gBG0Control.vofs;
-    REG_BG1HOFS = gBG1Control.hofs;
-    REG_BG1VOFS = gBG1Control.vofs;
-    REG_BG2HOFS = gBG2Control.hofs;
-    REG_BG2VOFS = gBG2Control.vofs;
-    REG_BG3HOFS = gBG3Control.hofs;
-    REG_BG3VOFS = gBG3Control.vofs;
-
-    REG_BG0CNT = BGCNT_Priority[BG0] | BGCNT_SCREENBASE(12) | BGCNT_CHARBASE(0) | BGCNT_WRAP; // 0x2C00
-    REG_BG1CNT = BGCNT_Priority[BG1] | BGCNT_SCREENBASE(13) | BGCNT_CHARBASE(0) | BGCNT_WRAP; // 0x2D00
-    if(gBG2Control.unk2 == 0x8000)
-        REG_BG2CNT = BGCNT_Priority[BG2] | BGCNT_SCREENBASE(14) | BGCNT_CHARBASE(2) | BGCNT_WRAP; // 0x2E08
-    else
-        REG_BG2CNT = BGCNT_Priority[BG2] | BGCNT_SCREENBASE(14) | BGCNT_CHARBASE(0) | BGCNT_WRAP; // 0x2E00
-    REG_BG3CNT = BGCNT_Priority[BG3] | BGCNT_SCREENBASE(15) | BGCNT_CHARBASE(2) | BGCNT_WRAP;
-    REG_BLDCNT = gBldCnt;
-}
+extern bool8 EnableInterrupts(void);
+extern bool8 DisableInterrupts(void);
+void nullsub_21(u16);
 
 void InitMusic(void)
 {
@@ -1261,37 +888,3 @@ void nullsub_21(u16 songIndex)
 {
 }
 
-void sub_800CB20(void)
-{
-    sub_800BA5C();
-    gUnknown_203B0B8++;
-    if((gRawKeyInput & (A_BUTTON | SELECT_BUTTON)) != 0)
-    {
-        Rand32Bit();
-    }
-    Rand32Bit();
-}
-
-// Unused
-u32 sub_800CB50(void)
-{
-    return gUnknown_203B0B8;
-}
-
-void nullsub_180(void)
-{
-}
-
-void xxx_call_update_bg_sound_input(void)
-{
-    xxx_update_bg_sound_input();
-}
-
-void nullsub_181(void)
-{
-}
-
-u32 sub_800CB70(void)
-{
-    return 0;
-}