diff --git a/config/SOUE01/symbols.txt b/config/SOUE01/symbols.txt
index 4ca23217..ef3ec587 100644
--- a/config/SOUE01/symbols.txt
+++ b/config/SOUE01/symbols.txt
@@ -19965,13 +19965,13 @@ shutdown__15dSndPlayerMgr_cFl = .text:0x8035E8B0; // type:function size:0xC
 startSound__15dSndPlayerMgr_cFPQ34nw4r3snd11SoundHandleUlPCQ44nw4r3snd14SoundStartable9StartInfo = .text:0x8035E8C0; // type:function size:0x90
 startSound__15dSndPlayerMgr_cFPQ34nw4r3snd11SoundHandlePCcPCQ44nw4r3snd14SoundStartable9StartInfo = .text:0x8035E950; // type:function size:0x6C
 fn_8035E9C0 = .text:0x8035E9C0; // type:function size:0x80
-fn_8035EA40 = .text:0x8035EA40; // type:function size:0x64
-fn_8035EAB0 = .text:0x8035EAB0; // type:function size:0x28
-fn_8035EAE0 = .text:0x8035EAE0; // type:function size:0xC
-fn_8035EAF0 = .text:0x8035EAF0; // type:function size:0xC
-fn_8035EB00 = .text:0x8035EB00; // type:function size:0x3C
-fn_8035EB40 = .text:0x8035EB40; // type:function size:0xC
-fn_8035EB50 = .text:0x8035EB50; // type:function size:0x3C
+loadGroup__15dSndPlayerMgr_cFUl = .text:0x8035EA40; // type:function size:0x64
+loadFileForSound__15dSndPlayerMgr_cFUl = .text:0x8035EAB0; // type:function size:0x28
+isLoadedFileForSound__15dSndPlayerMgr_cFUl = .text:0x8035EAE0; // type:function size:0xC
+isLoadedFileForBank__15dSndPlayerMgr_cFUl = .text:0x8035EAF0; // type:function size:0xC
+isLoadedBnkSeForGroup__15dSndPlayerMgr_cFP17dSndSourceGroup_c = .text:0x8035EB00; // type:function size:0x3C
+isLoadedFileAndWaveForSound__15dSndPlayerMgr_cFUl = .text:0x8035EB40; // type:function size:0xC
+isLoadedSeFileAndWaveForGroup__15dSndPlayerMgr_cFP17dSndSourceGroup_c = .text:0x8035EB50; // type:function size:0x3C
 getSomeUserParam__15dSndPlayerMgr_cCFUl = .text:0x8035EB90; // type:function size:0x80
 getRemoConSoundVariant__15dSndPlayerMgr_cCFUl = .text:0x8035EC10; // type:function size:0x5C
 getRemoConSoundVariantDemo__15dSndPlayerMgr_cCFUl = .text:0x8035EC70; // type:function size:0x84
@@ -20457,7 +20457,7 @@ fn_8036ECD0 = .text:0x8036ECD0; // type:function size:0x64
 startAdditionalBgm__12dSndBgmMgr_cFUl = .text:0x8036ED40; // type:function size:0x58
 fn_8036EDA0 = .text:0x8036EDA0; // type:function size:0x3F8
 fn_8036F1A0 = .text:0x8036F1A0; // type:function size:0x58
-fn_8036F200 = .text:0x8036F200; // type:function size:0x100
+prepareBossBgm__12dSndBgmMgr_cFPCc = .text:0x8036F200; // type:function size:0x100
 fn_8036F300 = .text:0x8036F300; // type:function size:0xA8
 musicForStageRelated = .text:0x8036F3B0; // type:function size:0x9EC
 fn_8036FDA0 = .text:0x8036FDA0; // type:function size:0x2C
@@ -20984,7 +20984,7 @@ getActiveGroupForName__15dSndSourceMgr_cFPCc = .text:0x80384820; // type:functio
 fn_803848B0 = .text:0x803848B0; // type:function size:0xAC
 fn_80384960 = .text:0x80384960; // type:function size:0x8C
 getInactiveGroup__15dSndSourceMgr_cFv = .text:0x803849F0; // type:function size:0xC
-fn_80384A00 = .text:0x80384A00; // type:function size:0x174
+addGroupToLoading__15dSndSourceMgr_cFP17dSndSourceGroup_c = .text:0x80384A00; // type:function size:0x174
 registerSource__15dSndSourceMgr_cFP14dSoundSource_c = .text:0x80384B80; // type:function size:0x178
 getCategory__14dSoundSource_cCFv = .text:0x80384D00; // type:function size:0x8
 isCertainEnemyType__15dSndSourceMgr_cFP14dSoundSource_c = .text:0x80384D10; // type:function size:0x78
@@ -21111,15 +21111,15 @@ __sinit_\d_snd_source_mgr_cpp = .text:0x803862E0; // type:function size:0x4 scop
 @4@postStartSound__14dSoundSource_cFRQ34nw4r3snd11SoundHandleP13dSndSeSound_cUl = .text:0x803864A0; // type:function size:0x8
 @4@setPause__23dSndSourceHarpRelated_cFbi = .text:0x803864B0; // type:function size:0x8
 @4@__dt__18dSndSourceHarpTg_cFv = .text:0x803864C0; // type:function size:0x8
-set__17dSndSourceGroup_cFlPCc = .text:0x803864D0; // type:function size:0x164
+setParam__17dSndSourceGroup_cFlPCc = .text:0x803864D0; // type:function size:0x164
 resetSoundSourceParam__17dSndSourceGroup_cFv = .text:0x80386640; // type:function size:0x2C
 __ct__17dSndSourceGroup_cFv = .text:0x80386670; // type:function size:0x118
-fn_80386790 = .text:0x80386790; // type:function size:0x120
+__ct__17dSndSourceGroup_cFlPCcPCcl = .text:0x80386790; // type:function size:0x120
 __dt__17dSndSourceGroup_cFv = .text:0x803868B0; // type:function size:0x54
-fn_80386910 = .text:0x80386910; // type:function size:0xEC
-fn_80386A00 = .text:0x80386A00; // type:function size:0xB0
-fn_80386AB0 = .text:0x80386AB0; // type:function size:0xBC
-fn_80386B70 = .text:0x80386B70; // type:function size:0xBC
+set__17dSndSourceGroup_cFlPCcPCcl = .text:0x80386910; // type:function size:0xEC
+setTemp__17dSndSourceGroup_cFlPCcl = .text:0x80386A00; // type:function size:0xB0
+clear__17dSndSourceGroup_cFv = .text:0x80386AB0; // type:function size:0xBC
+clearTemp__17dSndSourceGroup_cFv = .text:0x80386B70; // type:function size:0xBC
 calc__17dSndSourceGroup_cFv = .text:0x80386C30; // type:function size:0x10
 getNumSources__17dSndSourceGroup_cCFv = .text:0x80386C40; // type:function size:0x8
 registerSource__17dSndSourceGroup_cFP14dSoundSource_c = .text:0x80386C50; // type:function size:0x14
diff --git a/include/d/snd/d_snd_bgm_mgr.h b/include/d/snd/d_snd_bgm_mgr.h
index 71af46ca..ea5436fc 100644
--- a/include/d/snd/d_snd_bgm_mgr.h
+++ b/include/d/snd/d_snd_bgm_mgr.h
@@ -60,6 +60,8 @@ public:
 
     dSndBgmSound_c *getBgmSoundByIndex(u32 idx);
 
+    bool prepareBossBgm(const char *name);
+
     /**
      * E.g. Lizalfos fight in ET. Note that in the ET case, this is only called when triggering
      * the fight without a cutscene, the cutscene code runs through "ELizarufos_c_opening"
diff --git a/include/d/snd/d_snd_player_mgr.h b/include/d/snd/d_snd_player_mgr.h
index d25f9e95..94aa310c 100644
--- a/include/d/snd/d_snd_player_mgr.h
+++ b/include/d/snd/d_snd_player_mgr.h
@@ -2,6 +2,7 @@
 #define D_SND_PLAYER_MGR_H
 
 #include "d/snd/d_snd_mgr.h"
+#include "d/snd/d_snd_types.h"
 #include "d/snd/d_snd_util.h"
 #include "nw4r/snd/snd_MemorySoundArchive.h"
 #include "nw4r/snd/snd_SoundArchivePlayer.h"
@@ -65,6 +66,14 @@ public:
     void saveState2();
     void popToState2();
 
+    bool loadGroup(u32 groupId);
+    bool loadFileForSound(u32 soundId);
+    bool isLoadedFileForSound(u32 soundId);
+    bool isLoadedFileForBank(u32 bankId);
+    bool isLoadedBnkSeForGroup(dSndSourceGroup_c *group);
+    bool isLoadedFileAndWaveForSound(u32 soundId);
+    bool isLoadedSeFileAndWaveForGroup(dSndSourceGroup_c *group);
+
     u32 getFreeSize();
     bool loadDemoArchive(const char *demoArchiveName);
     const char *getSoundArchivePath();
diff --git a/include/d/snd/d_snd_source_group.h b/include/d/snd/d_snd_source_group.h
index aebd402c..4151770b 100644
--- a/include/d/snd/d_snd_source_group.h
+++ b/include/d/snd/d_snd_source_group.h
@@ -4,6 +4,7 @@
 #include "common.h"
 #include "d/snd/d_snd_misc.h"
 #include "d/snd/d_snd_types.h"
+#include "d/snd/d_snd_util.h"
 #include "nw4r/ut/ut_list.h"
 #include "sized_string.h"
 
@@ -20,9 +21,12 @@
 class dSndSourceGroup_c {
 public:
     dSndSourceGroup_c();
-    dSndSourceGroup_c(s32 sourceType, const char *, u32, s32 mSubtype);
+    dSndSourceGroup_c(s32 sourceType, const char *name, const char *origName, s32 subtype);
     ~dSndSourceGroup_c();
 
+    void set(s32 sourceType, const char *name, const char *origName, s32 subtype);
+    void setTemp(s32 sourceType, const char *name, s32 subtype);
+
     void registerSource(dSoundSource_c *);
     void unregisterSource(dSoundSource_c *);
 
@@ -34,8 +38,10 @@ public:
     dSoundSource_c *getSourceClosestToPlayer();
 
     s32 getNumSources() const;
-    void set(s32 type, const char *name);
+    void setParam(s32 type, const char *name);
     void calc();
+    void clear();
+    void clearTemp();
 
     const char *getName() const {
         return mName;
@@ -45,8 +51,8 @@ public:
         return mpOrigName;
     }
 
-    s32 getField_0x10() const {
-        return field_0x10;
+    s32 getSourceType() const {
+        return mSourceType;
     }
 
     bool isActive() const {
@@ -64,14 +70,14 @@ private:
 
     /* 0x00 */ nw4r::ut::Node mNode1;
     /* 0x08 */ nw4r::ut::Node mNode2;
-    /* 0x10 */ s32 field_0x10;
+    /* 0x10 */ s32 mSourceType;
     /* 0x14 */ s32 mSourceCategory;
     /* 0x18 */ s32 mSubtype;
     /* 0x1C */ bool mIsActive;
-    /* 0x1D */ u8 field_0x1D;
+    /* 0x1D */ bool field_0x1D;
     /* 0x1E */ SizedString<32> mName;
     /* 0x40 */ const char *mpOrigName;
-    /* 0x44 */ nw4r::ut::List mSourceList;
+    /* 0x44 */ LIST_MEMBER(dSoundSource_c, SubSource);
     /* 0x50 */ dSndSourceParam mParam;
     /* 0x64 */ dSoundSource_c *mpCachedClosestSourceToListener;
     /* 0x68 */ dSoundSource_c *mpCachedClosestSourceToPlayer;
diff --git a/include/d/snd/d_snd_source_mgr.h b/include/d/snd/d_snd_source_mgr.h
index 41503455..6bcbefad 100644
--- a/include/d/snd/d_snd_source_mgr.h
+++ b/include/d/snd/d_snd_source_mgr.h
@@ -78,6 +78,7 @@ private:
     dSndSourceGroup_c *getGroup(s32 sourceType, dAcBase_c *actor, const char *name, const char *origName, u8 subtype);
     bool fn_803846D0(s32 sourceType, const char *name, u8 subtype);
 
+    bool addGroupToLoading(dSndSourceGroup_c *group);
     void activateGroup(dSndSourceGroup_c *group);
     bool isActiveGroup(dSndSourceGroup_c *group) const;
 
diff --git a/src/d/snd/d_snd_id_mappers.cpp b/src/d/snd/d_snd_id_mappers.cpp
index 374827cc..029701ba 100644
--- a/src/d/snd/d_snd_id_mappers.cpp
+++ b/src/d/snd/d_snd_id_mappers.cpp
@@ -3,6 +3,7 @@
 #include "common.h"
 #include "d/snd/d_snd_mgr.h"
 #include "d/snd/d_snd_player_mgr.h"
+#include "d/snd/d_snd_source_enums.h"
 #include "d/snd/d_snd_source_group.h"
 #include "d/snd/d_snd_util.h"
 #include "d/snd/d_snd_id_mappers_data.h"
@@ -18,15 +19,15 @@ const char *getBaseVariant(const char *name) {
     return nullptr;
 }
 
-u32 getGrpId(s32 unk, const char *name) {
+u32 getGrpId(s32 sourceType, const char *name) {
     if (name == nullptr) {
         return -1;
     }
-    if (unk < 0) {
+    if (sourceType < 0) {
         return -1;
     }
 
-    if (unk >= 0x3C) {
+    if (sourceType >= SND_SOURCE_59 + 1) {
         return -1;
     }
 
@@ -49,22 +50,22 @@ u32 getGrpId(dSndSourceGroup_c *pGroup) {
     if (pGroup == nullptr) {
         return -1;
     }
-    u32 id = getGrpId(pGroup->getField_0x10(), pGroup->getName());
+    u32 id = getGrpId(pGroup->getSourceType(), pGroup->getName());
     if (id == -1 && pGroup->getOrigName() != nullptr) {
-        id = getGrpId(pGroup->getField_0x10(), pGroup->getOrigName());
+        id = getGrpId(pGroup->getSourceType(), pGroup->getOrigName());
     }
     return id;
 }
 
-u32 getBnkSeId(s32 unk, const char *name) {
+u32 getBnkSeId(s32 sourceType, const char *name) {
     if (name == nullptr) {
         return -1;
     }
-    if (unk < 0) {
+    if (sourceType < 0) {
         return -1;
     }
 
-    if (unk >= 0x3C) {
+    if (sourceType >= SND_SOURCE_59 + 1) {
         return -1;
     }
 
@@ -87,22 +88,22 @@ u32 getBnkSeId(dSndSourceGroup_c *pGroup) {
     if (pGroup == nullptr) {
         return -1;
     }
-    u32 id = getBnkSeId(pGroup->getField_0x10(), pGroup->getName());
+    u32 id = getBnkSeId(pGroup->getSourceType(), pGroup->getName());
     if (id == -1 && pGroup->getOrigName() != nullptr) {
-        id = getBnkSeId(pGroup->getField_0x10(), pGroup->getOrigName());
+        id = getBnkSeId(pGroup->getSourceType(), pGroup->getOrigName());
     }
     return id;
 }
 
-u32 getSeId(s32 unk, const char *name) {
+u32 getSeId(s32 sourceType, const char *name) {
     if (name == nullptr) {
         return -1;
     }
-    if (unk < 0) {
+    if (sourceType < 0) {
         return -1;
     }
 
-    if (unk >= 0x3C) {
+    if (sourceType >= SND_SOURCE_59 + 1) {
         return -1;
     }
 
@@ -125,9 +126,9 @@ u32 getSeId(dSndSourceGroup_c *pGroup) {
     if (pGroup == nullptr) {
         return -1;
     }
-    u32 id = getSeId(pGroup->getField_0x10(), pGroup->getName());
+    u32 id = getSeId(pGroup->getSourceType(), pGroup->getName());
     if (id == -1 && pGroup->getOrigName() != nullptr) {
-        id = getSeId(pGroup->getField_0x10(), pGroup->getOrigName());
+        id = getSeId(pGroup->getSourceType(), pGroup->getOrigName());
     }
     return id;
 }
diff --git a/src/d/snd/d_snd_player_mgr.cpp b/src/d/snd/d_snd_player_mgr.cpp
index 9930f624..3663b779 100644
--- a/src/d/snd/d_snd_player_mgr.cpp
+++ b/src/d/snd/d_snd_player_mgr.cpp
@@ -7,6 +7,7 @@
 #include "d/snd/d_snd_bgm_mgr.h"
 #include "d/snd/d_snd_control_player_mgr.h"
 #include "d/snd/d_snd_file_mgr.h"
+#include "d/snd/d_snd_id_mappers.h"
 #include "d/snd/d_snd_mgr.h"
 #include "d/snd/d_snd_small_effect_mgr.h"
 #include "d/snd/d_snd_source.h"
@@ -257,6 +258,44 @@ nw4r::snd::SoundStartable::StartResult dSndPlayerMgr_c::startSound(
     return startSound(pHandle, id, pStartInfo);
 }
 
+bool dSndPlayerMgr_c::loadGroup(u32 groupId) {
+    if (dSndMgr_c::getPlayer().IsLoadedGroup(groupId)) {
+        // TODO - true would probably make more sense if the return value
+        // was checked at all...
+        return false;
+    }
+    return dSndMgr_c::GetInstance()->loadGroup(groupId, nullptr, 0);
+}
+
+bool dSndPlayerMgr_c::loadFileForSound(u32 soundId) {
+    if (soundId == -1) {
+        return false;
+    }
+    return dSndFileManager::loadFileForSound(
+        *dSndMgr_c::GetInstance()->getArchive(), soundId, dSndMgr_c::GetInstance()->getSoundHeap()
+    );
+}
+
+bool dSndPlayerMgr_c::isLoadedFileForSound(u32 soundId) {
+    return dSndFileManager::isLoadedFileForSound(&dSndMgr_c::getPlayer(), soundId);
+}
+
+bool dSndPlayerMgr_c::isLoadedFileForBank(u32 bankId) {
+    return dSndFileManager::isLoadedFileAndWaveForBank(&dSndMgr_c::getPlayer(), bankId);
+}
+
+bool dSndPlayerMgr_c::isLoadedBnkSeForGroup(dSndSourceGroup_c *group) {
+    return isLoadedFileForBank(getBnkSeId(group));
+}
+
+bool dSndPlayerMgr_c::isLoadedFileAndWaveForSound(u32 soundId) {
+    return dSndFileManager::isLoadedFileAndWaveForSound(&dSndMgr_c::getPlayer(), soundId);
+}
+
+bool dSndPlayerMgr_c::isLoadedSeFileAndWaveForGroup(dSndSourceGroup_c *group) {
+    return isLoadedFileAndWaveForSound(getSeId(group));
+}
+
 u32 dSndPlayerMgr_c::getRemoConSoundVariant(u32 soundId) const {
     const char *label = dSndMgr_c::getSoundLabelString(soundId);
     SizedString<64> variant;
diff --git a/src/d/snd/d_snd_source_group.cpp b/src/d/snd/d_snd_source_group.cpp
index 67880c52..e73f4903 100644
--- a/src/d/snd/d_snd_source_group.cpp
+++ b/src/d/snd/d_snd_source_group.cpp
@@ -4,12 +4,13 @@
 #include "common.h"
 #include "d/snd/d_snd_source.h"
 #include "d/snd/d_snd_source_enums.h"
+#include "d/snd/d_snd_source_mgr.h"
 #include "d/snd/d_snd_state_mgr.h"
 #include "nw4r/ut/ut_list.h"
 
 #include <cmath>
 
-void dSndSourceGroup_c::set(s32 sourceType, const char *name) {
+void dSndSourceGroup_c::setParam(s32 sourceType, const char *name) {
     resetSoundSourceParam();
     bool assignedParam = false;
 
@@ -71,7 +72,7 @@ void dSndSourceGroup_c::resetSoundSourceParam() {
 dSndSourceGroup_c::dSndSourceGroup_c()
     : mSubtype(0),
       mIsActive(false),
-      field_0x1D(0),
+      field_0x1D(false),
       mName(""),
       mpOrigName(nullptr),
       mpCachedClosestSourceToListener(nullptr),
@@ -79,14 +80,61 @@ dSndSourceGroup_c::dSndSourceGroup_c()
       mCalculatedClosestToListener(false),
       mCalculatedClosestToPlayer(false) {
     // TODO offsetof
-    nw4r::ut::List_Init(&mSourceList, 0x138);
+    nw4r::ut::List_Init(&mSubSourceList, 0x138);
     resetSoundSourceParam();
 }
 
+dSndSourceGroup_c::dSndSourceGroup_c(s32 sourceType, const char *name, const char *origName, s32 subtype)
+    : mSourceCategory(-1),
+      mSubtype(subtype),
+      mIsActive(false),
+      field_0x1D(false),
+      mName(name),
+      mpOrigName(origName),
+      mpCachedClosestSourceToListener(nullptr),
+      mpCachedClosestSourceToPlayer(nullptr),
+      mCalculatedClosestToListener(false),
+      mCalculatedClosestToPlayer(false) {
+    nw4r::ut::List_Init(&mSubSourceList, 0x138);
+    setParam(sourceType, name);
+}
+
+void dSndSourceGroup_c::set(s32 sourceType, const char *name, const char *origName, s32 subtype) {
+    mSourceCategory = dSndSourceMgr_c::getSourceCategoryForSourceType(sourceType, name);
+    setParam(sourceType, name);
+    mSourceType = sourceType;
+    mName = name;
+    mSubtype = subtype;
+    mpCachedClosestSourceToPlayer = nullptr;
+    mpCachedClosestSourceToListener = nullptr;
+    mCalculatedClosestToPlayer = false;
+    mCalculatedClosestToListener = false;
+    mpOrigName = origName;
+}
+
+void dSndSourceGroup_c::setTemp(s32 sourceType, const char *name, s32 subtype) {
+    mSourceType = sourceType;
+    mName = name;
+    mSubtype = subtype;
+}
+
 dSndSourceGroup_c::~dSndSourceGroup_c() {
     clearList();
 }
 
+void dSndSourceGroup_c::clear() {
+    clearList();
+    mIsActive = false;
+    field_0x1D = false;
+    mName = "";
+}
+
+void dSndSourceGroup_c::clearTemp() {
+    mIsActive = false;
+    field_0x1D = false;
+    mName = "";
+}
+
 void dSndSourceGroup_c::calc() {
     // Reset freshness flags, computed on-demand
     mCalculatedClosestToPlayer = false;
@@ -94,26 +142,26 @@ void dSndSourceGroup_c::calc() {
 }
 
 s32 dSndSourceGroup_c::getNumSources() const {
-    return nw4r::ut::List_GetSize(&mSourceList);
+    return nw4r::ut::List_GetSize(&mSubSourceList);
 }
 
 void dSndSourceGroup_c::registerSource(dSoundSource_c *source) {
     if (source != nullptr) {
-        nw4r::ut::List_Append(&mSourceList, source);
+        appendSubSource(source);
     }
 }
 
 void dSndSourceGroup_c::unregisterSource(dSoundSource_c *source) {
     if (source != nullptr) {
-        nw4r::ut::List_Remove(&mSourceList, source);
+        removeSubSource(source);
     }
 }
 
 void dSndSourceGroup_c::clearList() {
-    dSoundSource_c *source = static_cast<dSoundSource_c *>(nw4r::ut::List_GetFirst(&mSourceList));
+    dSoundSource_c *source = getSubSourceFirst();
     while (source != nullptr) {
-        nw4r::ut::List_Remove(&mSourceList, source);
-        source = static_cast<dSoundSource_c *>(nw4r::ut::List_GetFirst(&mSourceList));
+        removeSubSource(source);
+        source = getSubSourceFirst();
     }
 }
 
@@ -124,8 +172,8 @@ dSoundSource_c *dSndSourceGroup_c::getSourceClosestToListener() {
 
     mpCachedClosestSourceToListener = nullptr;
     f32 closest = INFINITY;
-    for (dSoundSource_c *source = static_cast<dSoundSource_c *>(nw4r::ut::List_GetFirst(&mSourceList));
-         source != nullptr; source = static_cast<dSoundSource_c *>(nw4r::ut::List_GetNext(&mSourceList, source))) {
+    for (dSoundSource_c *source = getSubSourceFirst();
+         source != nullptr; source = getSubSourceNext(source)) {
         if (source->getSourceType() != SND_SOURCE_PLAYER_HEAD && source->getSourceType() != SND_SOURCE_NPC_HEAD) {
             f32 dist = source->getDistanceToListener();
             if (dist < closest) {
@@ -143,14 +191,14 @@ dSoundSource_c *dSndSourceGroup_c::getSourceClosestToPlayer() {
         return mpCachedClosestSourceToPlayer;
     }
 
-    if ((s32)nw4r::ut::List_GetSize(&mSourceList) <= 1) {
-        return static_cast<dSoundSource_c *>(nw4r::ut::List_GetFirst(&mSourceList));
+    if ((s32)nw4r::ut::List_GetSize(&mSubSourceList) <= 1) {
+        return getSubSourceFirst();
     }
 
     mpCachedClosestSourceToPlayer = nullptr;
     f32 closest = INFINITY;
-    for (dSoundSource_c *source = static_cast<dSoundSource_c *>(nw4r::ut::List_GetFirst(&mSourceList));
-         source != nullptr; source = static_cast<dSoundSource_c *>(nw4r::ut::List_GetNext(&mSourceList, source))) {
+    for (dSoundSource_c *source = getSubSourceFirst();
+         source != nullptr; source = getSubSourceNext(source)) {
         if (source->getSourceType() != 1 && source->getSourceType() != 48) {
             f32 dist = source->getDistanceToPlayer();
             if (dist < closest) {
diff --git a/src/d/snd/d_snd_source_mgr.cpp b/src/d/snd/d_snd_source_mgr.cpp
index 90cafbc6..b7c5d741 100644
--- a/src/d/snd/d_snd_source_mgr.cpp
+++ b/src/d/snd/d_snd_source_mgr.cpp
@@ -2,6 +2,7 @@
 
 #include "common.h"
 #include "d/a/d_a_base.h"
+#include "d/snd/d_snd_bgm_mgr.h"
 #include "d/snd/d_snd_control_player_mgr.h"
 #include "d/snd/d_snd_id_mappers_data.h"
 #include "d/snd/d_snd_player_mgr.h"
@@ -372,7 +373,7 @@ dSndSourceMgr_c::dSndSourceMgr_c()
     nw4r::ut::List_Init(&field_0x3848, 0x15C);
     nw4r::ut::List_Init(&mHarpRelatedList, 0x160);
 
-    mpDefaultGroup = new dSndSourceGroup_c(-1, "Default", 0, 0);
+    mpDefaultGroup = new dSndSourceGroup_c(-1, "Default", nullptr, 0);
 
     for (dSndSourceGroup_c *group = &mGroups[0]; group < &mGroups[NUM_GROUPS]; group++) {
         nw4r::ut::List_Append(&mGroup2List, group);
@@ -393,6 +394,24 @@ void dSndSourceMgr_c::calcEnemyObjVolume() {
     }
 }
 
+dSndSourceGroup_c *dSndSourceMgr_c::getGroup(s32 sourceType, dAcBase_c *actor, const char *name, const char *origName, u8 subtype) {
+    dSndSourceGroup_c *group = getActiveGroupForName(name);
+    if (group != nullptr) {
+        return group;
+    }
+
+    group = getInactiveGroup();
+    if (group != nullptr) {
+        group->set(sourceType, name, origName, subtype);
+        activateGroup(group);
+        addGroupToLoading(group);
+        dSndBgmMgr_c::GetInstance()->prepareBossBgm(name);
+        return group;
+    }
+    
+    return nullptr;
+}
+
 dSndSourceGroup_c *dSndSourceMgr_c::getActiveGroupForName(const char *name) {
     for (dSndSourceGroup_c *it = getGroup1First(); it != nullptr; it = getGroup1Next(it)) {
         if (streq(it->getName(), name)) {
@@ -406,6 +425,10 @@ dSndSourceGroup_c *dSndSourceMgr_c::getInactiveGroup() {
     return getGroup2First();
 }
 
+bool dSndSourceMgr_c::addGroupToLoading(dSndSourceGroup_c *source) {
+
+}
+
 void dSndSourceMgr_c::registerSource(dSoundSource_c *source) {
     if (source != nullptr) {
         nw4r::ut::List_Append(&mAllSourcesList, source);