Trying this out now.
Last.fm Discover is a personalised music player that introduces you to bands from around the world by letting you browse through musical styles that you may already know or want to learn more about. You won’t find the latest X-factor winner or the latest plastic boyband manufactured by evil scientists in a lab somewhere. Some of them are quite rough around the edges – make use of the ban button when you come across something unlistenable – but you’ll also reach for the love button as you discover diamonds in this amazing library of tracks.
It’s a good reason to go to the Last.fm site if you haven’t been in a while. The strength with Last.fm radio has always been how specific you can get.
But, as one commenter points out, this is for artists that have free/unrestricted licensed tracks on Last.fm. You’re likely to hear something you’ve never heard by somebody you’ve never heard of.