Lala - Discover, Listen, Enjoy
Interesting site...lets you trade CDs you own for $1.50. Not bad. Apparently also to hook up with local used record stores to trade if you don't want to wait for someone to trade the music.
Sorta like BookCrossing only with money involved. Brilliant!
Anyway, I stumped it with a query for Wolfgang Parker. It found Wolf on some compilations however. It DID have Fenster however, which surprised me...although it did not have the Fenster album I own.