SoundCloud - Enjoy music & follow favourite artists
Bandcamp - Discover amazing music and directly support the artists who make it.
yungcloud - "the world's leading underground music streaming service."
Openwhyd - Collect and Share the tracks you love.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
hearthis.at - Upload unlimited music and share it with friends and fans for free.