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.
Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Audiu - Audiu is one of the largest platforms for the online music community, allowing users to collaborate, organize and publish their musical projects.
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.
TogetherJS - TogetherJS is a platform designed by the Mozilla Labs with the feature of real-time collaboration for websites and even applications in addition to watching movies and videos together.
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm