Heads up on an interesting bit of software, if ye have a huge library of
compressed music on a computer (iTunes or not).

http://www.musicip.com/

Their aim is to identify music tracks acoustically and find similar
patterns that enable intelligent sequencing, like Apple iTunes Genius
and (*sniffle* gone from UK) Pandora - except the whole collection used
is that of your stored media, be it AAC, MP3, OGG, FLAC, WMA or WAV.
Editing playlists is a thing of the past.

I've got my copy installed into SqueezeCenter (the open source server
software necessary for squeezebox's and kin) and compared to a random
mix of disjointed crashes of genre that normally happens with my
collected audio, this stuff really works finding tracks otherwise buried
under it all.

Free to try as well :-)

--
Adrian C