Openwhyd - Collect and Share the tracks you love.
Radio4000 - Radio4000 lets you discover user curated radios from around the world, manage your online music...
Music Smasher - Find any song. Music Smasher searches Spotify, Rdio, SoundCloud, Bandcamp, and YouTube.
Bandcamp - Discover amazing music and directly support the artists who make it.
SoundClick - SoundClick is a music-based social community.
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