What website gives recommendations of albums based on ratings of other albums

I have rated over 400 movies on netflix, and due to my ratings netflix has recommended some really good movies I’ve never heard of. Several of my favorite movies of all time are movies I’d never heard of until netflix recommended them.

So is there a website that does the same with albums, you rate the albums you’ve heard and the website tailors different albums or artists recommendations for you based on that?

Amazon does that.

So does Last.fm

Pandora.com does something like this. It even plays the music for you!