I was initially skeptical about this site, but a short trial period with it convinced me that it was the real thing. I’ve managed to find quite a bit of relatively hard-to-find jazz and experimental stuff, as well as more mainstream recordings. The radio function is an excellent way to sample stuff across albums by one artist or by a set of similar artists. If you subscribe for about a tenner a month, you get to download material as well. I know this sounds like an ad, but this is the first online music site I’ve been this impressed by. Made me quickly jump ship from LastFM (as much fun as that site was). Give it a try.