A supergroup is a very fragile thing. Rock bands are always about balancing huge egos, but when those egos are oversized from the get-go it can lead to huge problems. That's why supergroups like Blind Faith often fail to go beyond a single album, and why long-lasting ones like CSNY had drama that never seemed to end. In honor of upcoming tours by Prophets of Rage and Temple of Dog, we asked our readers to select their favorite supergroups. Here are the results.