Hacking questions about ssbb codes

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hi i want to ask a few questions bout the ocarina ssbb pal codes.
how do you use the music modifier code and wat is it. im guessing it can change the music on stages like final destination.
here is the music modifier code:
4A000000 90180F08
14000076 FF00XXXX
E0000000 80008000

and what is the stage override code and how do u use it???
046D75AC 3B6000XX
00 - Battle
01 - BattleField (Battlefield)
02 - Final (Final Destination)
03 - Dolpic (Delfino Plaza)
04 - Mansion (Luigi's Mansion)
05 - MarioPast (Mushroomy Kingdom)
06 - Kart (Mario Circuit)
07 - Donkey (75 m)
08 - Jungle (Rumble Falls)
09 - Pirates (Pirate Ship)
0A - Zelda2 (Bridge of Eldin)
0B - Norfair (Norfair)
0C - Orpheon (Frigate Orpheon)
0D - Crayon (Yoshi's Island)
0E - Halberd (Halberd)
0F - TestHalberd_00
10 - TestHalberd_01
11 - TestHalberd_02
12 - Karby2
13 - Starfox (Lylat Cruise)
14 - Stadium (Pokémon Stadium 2)
15 - Tengan (Spear Pillar)
16 - Fzero (Port Town Aero Dive)
17 - Ice (Summit)
18 - Gw (Flat Zone 2)
19 - Emblem (Castle Siege)
1A - TestEmblem_00
1B - TestEmblem_01
1C - Madein (WarioWare, Inc.)
1D - Earth (Distant Planet)
1E - Palutena (Skyworld)