Cymbal - Music discovery powered by friends
Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Noted - Social music discovery
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.
humit - A social networking app for music sharing and discovery.
Encore Music - An open source, extendable music player for Android.