I've Got an application to join:
(I've used this same app before on microblock if thats a problem)
It's a garage Band type creation:

The group of bricks on the right is the garage band.
This has 4 rows of sound, the bottom one being the synth sounds, and the other three each having 4 sounds that could be used in a song.
This has an endless loop of 12 sounds and can be shut off by pressing a black button near the play button.
The group of blocks on the left are the test sounds. This shows which color on each row has which sound. When you click a block here, it will give a sample of the sound that will play on the garage band.
If you need me to have this in a server, the only issue are the colors. I made this in my firend's server (Truce) and he has a colorset that no one else has. This could actually screw everything up because the garage band wont be able to read the colors.
If you have any questions just contact me,
Thanks!