22 free to download tracks created using a music composition software called SuperCollider with the requirement that each piece must fit into a single 140 character Tweet.

http://www.newscientist.com/article/dn18173

"SuperCollider is a language used by electroacoustic composers and some DJs to synthesise a wide variety of sounds. Tunes several minutes long – and containing more than 140 notes – can be notated in fewer than 140 characters by incorporating repeating sequences and random elements."

http://supercollider.sourceforge.net/sc140/