Bandcamp - Discover amazing music and directly support the artists who make it.
Radio4000 - Radio4000 lets you discover user curated radios from around the world, manage your online music...
SoundCloud - Enjoy music & follow favourite artists
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
Music-Map - The Music-Map is the Tourist Map of Music, part of Gnod, the Global Network of Discovery.
Hype Machine - Hype Machine lets music fans discover artists. Its technology scrapes audio files from diverse music blogs and posts them to the website. Users can peruse the site or sign up for Hype Machine's newsletter for updates.