SoundCloud - Enjoy music & follow favourite artists
yungcloud - "the world's leading underground music streaming service."
Bandcamp - Discover amazing music and directly support the artists who make it.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
Openwhyd - Collect and Share the tracks you love.
MiXoLiCiouS - MiXoLiCiouS is an audio hosting service where you can upload and share your tracks, remixes, and DJ mixes as an alternative to SoundCloud.