Mixmatcher

[TaranT]

Here's an odd site that was started by the same guy who hosts the RIAA Radar site. It's called Mixmatcher:

Mixmatcher is part mixtape database, part playlist generator, part contextual music metadata database, part new way to discover new music, and part human collaborative filtering. Mixmatcher is a collaborative playlist environment, where people give meaning to songs by adding them to playlists. The more playlists that a song gets added to, the more meaning, contexts, and potential uses it gives that song.

For example, if you want to put together a playlist of animal songs, or songs about trains, this is the place to look.