Social Radio

https://www.last.fm

Web 2.0 ears: online radio that adapts itself to the listener.
It remembers what you are listening to (and what you do not want to listen to), and toss new songs based on the choice of other users with similar tastes. If you put a small nozzle on the player, Last.fm will also start to take into account the music you are listening at home.

At the moment, participants Last. Fm listened to and appreciated almost 3 billion tracks, so there's nothing to rely on.
The best way to find out any new artists on Internet is not yet figured out (except for competitors from Pandora.com and LAUNCHcast).

It is believed that Last.fm really should become the 'last radio': the world of FM radio stations will change irrepressibly, but the big Their part will quietly wither away.
It will happen when the majors give Last.fm to use their bottomless archives and the newest Revenues, and this is all going to. Source: Big City