Founders Nation - Find or become a startup cofounder
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.
CoFoundersLab - Meet 250,000+ entrepreneurs online
Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Findnlink - Find people to work with on your ideas.
Kompoz - Kompoz is an online platform for crowd-sourcing music creation, making you record, create or publish music with the guidelines of a world-class musical expert.