Cymbal - Music discovery powered by friends
Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Noted - Social music discovery
Turntable.fm - Turntable.fm is a social media website developed by Billy Chasen and Seth Goldstein that allows the audience to stream their own music.
humit - A social networking app for music sharing and discovery.
Vampr - Connect with musicians, industry & music lovers alike