The M64 commands are used in creating sequences in Super Mario 64, it has a midi-like structure, except more compressed. Some of these commands can vary in how many bytes long they could be. In M64, we have the header, the track and music event, the header is the beginning of the M64, what all M64s must have, it contains necessary information about the M64, like the NLST, amount of channels, tempo and master volume, the track contains all necessary information about the M64, like pointing to the music event address, setting track volume and so on, the music event contains all the play note(0x00 - 0xBF), transposition(0xC2) and rest commands(0xC0).

Points to track data for a specific channel, indicated by the second nibble of status byte, a track offset is started with a 0xC4 command.

90 [AA AA]

Example: Load track data from offset 0x16

90 00 16

Flags for the M64 file.

D3 [AA]

List of Flags(Hexadecimal);

Used to disable channels.

D6 [AA AA]

Example: Disable channel 0

D6 00 01

Volume for the whole M64.

DB [AA]

Example: Set master volume to 50

DB 50

Tempo in BPM.

DD [AA]

Example: Set tempo to 120

DD 78