Changing the music in SM64

If you wanna change music, first chosse the desired music and the level you want to change. For reference, 
here's a level offset list:

Haunted House

382E34 [31, 04, 00, 04]


Cool Cool Mountain

395FD0 [31, 04, 00, 02]

396038 [31, 04, 00, 06] --Penguin Slide


Inside Castle

3CFDCC [31, 04, 00, 01]

3CFEC0 [31, 04, 00, 01]

3CFF98 [31, 04, 00, 01]


Hazy Maze Cave

3E6EFC [31, 04, 00, 01]


Shifting Sand Land

3FBDF0 [31, 04, 00, 03]

3FBEC4 [31, 04, 00, 01] --Pyramid

3FBF10 [31, 04, 00, 01] --Boss Room


Bob-Omb's Battlefield

405E68 [31, 04, 00, 00]


Snow Man's land

40EAEC [31, 04, 00, 02]

40EB6C [31, 04, 00, 02]


Wet Dry World

41A484 [31, 04, 00, 01]

41A4D8 [31, 04, 00, 05] --Underwater City


Jolly Roger Bay

424384 [31, 04, 00, 05]

4243EC [31, 04, 00, 05]


Tiny Huge Island

42CB00 [31, 04, 00, 00]

42CBB0 [31, 04, 00, 00]

42CC50 [31, 04, 00, 00]


Tick Tock Clock

43760C [31, 04, 00, 01]


Rainbow Ride

44A764 [31, 04, 00, 01]


Castle Grounds

454C08 [31, 04, 00, 00]


Bowser 1 Course

45C2E0 [31, 04, 00, 01]


Vanish Cap

4613DC [31, 04, 00, 01]


Bowser's Fire Sea

46ACB0 [31, 04, 00, 01]


Secret Aquarium

46C2D4 [31, 04, 00, 05]


Bowser 3 Course

4780F8 [31, 04, 00, 01]


Lethal Lava Land

48D2EC [31, 04, 00, 01]

48D354 [31, 04, 00, 01]


Dire Dire Docks

495E00 [31, 04, 00, 05]

495E7C [31, 04, 00, 05]


Whomp's Fortress

49E1FC [31, 04, 00, 01]


Castle Courtyard

4AF838 [31, 04, 00, 01]


Peach's Secret Slide

4B7FCC [31, 04, 00, 06]


Metal Cap

4BEB40 [31, 04, 00, 01]


Wing Cap

4C2824 [31, 04, 00, 01]


Bowser 1 Battle Platform

4C425C [31, 04, 00, 01]


Rainbow Clouds Bonus

4CDAE0 [31, 04, 00, 02]


Bowser 2 Battle Platform

4CEB28 [31, 04, 00, 01]


Bowser 3 Battle Platform

4D1748 [31, 04, 00, 01]


Tall Tall Mountain

4EB7AC [31, 04, 00, 01]

4EB818 [31, 04, 00, 06] --Slide part 1

4EB864 [31, 04, 00, 06] --Slide part 2

4EB8CC [31, 04, 00, 06] --Slide part 3

---------------- THE LIST ENDS HERE ---------------------

After you have prepared everything, open the SM64 ROM in your favorite hex editor and jump to the level offset of the level whose music you want to change (see offset list). Before this offset, you'll see the 
string 36 08 00 XX 00 YY (xx and yy are random numbers). XX is the music variable, YY the music number. 
Change the music number to your favorite music according to the list below. Note that you only need to change the variable when it's explicitely said, otherwise leave it at 00.

	00-nothing
	01-end level
	02-SMB music title
	03-Bob-omb's Battlefield
	04-Inside Castle walls
	05-Dire Dire Docks
	06-Lethal Laval land
	07-Bowser battle
	08-Snow
	09-Slide
	0A-Big Boo's Haunt (set variable to 06)
	0B-Piranha plant lullaby
	0C-Hazy Maze
	0D-Star select
	0E-Wing cap
	0F-Metal cap
	10-Bowser Message
	11-Bowser course
	12-Star catch
	13-Ghost Merry-go-round
	14-Start and End Race with Koopa the Quick
	15-Star appears
	16-Boss fight
	17-Take a Key
	18-Looping stairs
	19-Final Bowser (set variable to 02)
	1A-Credits song
	1B-Unknown
	1C-Toad
	1D-Peach message
	1E-Intro Castle sequence
	1F-End fanfare
	20-End music
	21-Menu
	22-Lakitu

Now save.