Undrtone - Social layer on top of Spotify and Rdio from Scott Vener
CLiGGO MUSIC - CLiGGO MUSIC provides free music enjoyment on your pc, smart phone or tablet.
PlaylistMap - Connect with Spotify playlist curators from around the world
Audionautix - Audionautix is the web-based music platform that provides you the songs, tunes, and music of famous singers which you can use for your audience and business.
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
Motion Array Free Stock Music - Motion Array Free Stock Music is a web-based platform that offers you a wide range of music and tunes which is royalty-free, and you can download the songs and tunes in mp3 format.