Completed and on site (http://www.ninsheetmusic.org/browse/series/TheLegendofZelda)
In The Zora hall, you could go into the Piano player's room and hear this song:
http://www.youtube.com/watch?v=jsc2s8agLRI
I guess it's just called Piano Practice, but here you go. I'm pretty sure it's in C. It starts out in G, but it sound cool.
Piano Practice, Majora's Mask [N64]
This song is actually the Ending Theme of the original Zelda for the NES. G-Han arranged it.
http://ninsheetm.us/sheetmusic.php?franchise=TheLegendofZelda
It's the first song of the page.
It's already on the site under Majora's Mask as well. It's called "Evan's Room".
thanks dogs