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Indaba, which launched earlier this year, provides a meeting ground for musicians. Anyone can upload a track — whether it's a beat, or a melody or a full-fledged song — and can solicit other musicians to record new or different parts. Similarly, musicians looking to add or build on other people's songs can search for these open "sessions," which are tagged by genre and instrument. They can ask to be invited to play and can send audition tracks.

Though the Indaba guys were at Harvard at the same time as Facebook founder Mark Zuckerberg, and plan to release their own Facebook application