80319328
80320544 (A0 = layer, A1 = song id, A2 = fade-in time) play song
80320678 (A0 = layer, A1 = fade-out time)
80321F48 (A0 = fade-out time)                          kill song, layer 1
80321F48 (A0 = song id)                                play song, layer 1

Music values:
 00 No music
 01 Collect star
 02 Demo screen
 03 Grassy level
 04 Inside castle
 05 Water
 06 Fire/Desert
 07 Bowser fight
 08 Snow
 09 Slide/race
 0A Haunted
 0B Lullaby
 0C Cave
 0D Star select
 0E Wing cap
 0F Metal cap
 10 Bowser warning
 11 Bowser course
 12 New record
 13 Merry go round
 14 Race start
 15 Star unlocked
 16 Mini boss
 17 Collected Key
 18 Endless stairs
 19 Bowser fight (final)
 1A Credits
 1B Solved puzzle
 1C Toad dialogue
 1D Peach dialogue
 1E Intro theme
 1F End game
 20 End game 2
 21 File select
 22 Intro theme 2