Openwhyd - Collect and Share the tracks you love.
Songlink - Share music with anyone.
Music Smasher - Find any song. Music Smasher searches Spotify, Rdio, SoundCloud, Bandcamp, and YouTube.
humit - A social networking app for music sharing and discovery.
FoxTube - Play YouTube video continuously with playlists. FoxTube features:
aux.app - A free web-based music platform to play music from other popular online streaming services.