Hey people.
I have modified this music rom with help of hex workshop:
http://www.zophar.net/music/gbs/legend-of-zelda-oracle-of-ages.html

It is easy but possible to corrupt the music without opcode hangs.
Just use the Replace tool by pressing CTRL+H, replace + with - and so on.

The screen is white in this rom but you can switch the current playing song with arrow keys.

Download the attachment:
http://rapidshare.com/files/387972266/ZeldaOoA_songs_hacked.zip.html