I have often thought that it would be interesting to do a collaborative pass-around music project on the internet. Like the person to start it would decide on a chord progression and record a track with one instrument. Then he could pass it on the the next person, who would record another instrument (or vocal or whatever) track to go with it, and so on and so forth. And then finally the conglomeration of tracks could be passed out to everyone who participated, for each person to mix down into whatever final mix they are happiest with. :D