Glockenspiel put through some filters in Audacity, plus some more awesome* clarinet.
Another dude who did a similar project. Some of these are pretty interesting, check it out.
(All of them are 60 seconds in length, so no 20-minute-long tracks of people randomly screeching and honking wildly on saxophone and guitar and dancing around and swearing loudly. Ya gotta come here for that.)
*played by Kerrith, who doesn't play clarinet but has her brother's old junior-high model sitting around. Thanks, Clark.