From CloudModding MM Wiki
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THIS IS FOR THE MM (U) 1.0 DECOMPRESSED ROM! USE IT!
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Just go to the offsets to edit the music stuff.
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Song Activators:
Song of Time: C6EFBE
Inverted Song of Time: C6EFF4
Song of Double Time: C6EFFD
Song of Healing: C6EFC7
Epona's Song: C6EFD0
Song of Soaring: C6EFD9
Song of Storms: C6EFE2
Sonata of Awakening: C6EF88
Lullabye Intro: C6F006
Goron Lullabye: C6F006 (shared with Lullabye Intro: just the extra byte after)
New Wave Bossa Nova: C6EF9A
Elegy of Emptiness: C6EFA3
Oath to Order: C6EFAC
BETA Saria's Song!: C6EFB5
BETA Sun's Song!: C6EFEB
Milk Bar Songs:
> Link: C6F00F
> Deku Link: C6F02A
> Goron Link: C6F018
> Zora Link: C6F021
Mikau's Jams:
 > Jam 1 (Diary): C508DA
 > Jam 2 (Diary):
 > Jam 1: C6F033
 > Jam 2: C6F03D

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The first byte is the number of notes in the song, the rest are the notes, in the order they must be played.
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Note Values:
A = 00
Down = 01
Right = 02
Left = 03
Up = 04
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Playback Data:
Song of Time: C6D944
Inverted Song of Time: C6DD04
Song of Double Time: C6E0C4 (This may be the offset? I can't find any others.)
Song of Healing: C6D9E4
Epona's Song: C6DA84
Song of Soaring: C6DB24
Song of Storms: C6DBC4
Sonata of Awakening: C6D584
Lullabye Intro: C6DE44
Goron Lullabye: C6D624
New Wave Bossa Nova: C6D6C4
Elegy of Emptiness: C6D764
Oath to Order: C6D804
BETA Saria's Song!: C6D8A4
BETA Sun's Song!: C6DC64
Milk Bar Songs:
> Link: C6DEE4
> Deku Link: C6E0C4
> Goron Link: C6DF84
> Zora Link: C6E024
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Music Format:
XX00 YYYY ZZZZ AABB
X = Note
Y = Length of time held
Z = Volume
A = Pitch
B = Vibrato

Note Values:
A = 02
Down = 05
Right = 09
Left = 0B
Up = 0E
End = 00
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Additional Note:
I found Ocarina Song coding left over from Ocarina of Time - other than Saria's and Sun's Songs! Playback data for Minuet of Forest!

The start offset is C6E484, the data going from C6E484 to C6E4C5 (for nulling other notes, I suppose). I loaded it up over Epona's Song, and it all fits perfectly. I can't find the activator data anywhere, though, so loading it up ingame with a GameShark Code isn't something that I see right now.
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Flotonic
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Yes. I documented this myself later in 2009 and didn't steal it. Just saying this so you don't get confused about the custom songs in OoT, which I don't own any rights over. It'll only go up in documentation here if I document them myself.
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