
Apple’s new iTunes Genius feature picks playlists based on a song and the anonymized data that has been submitted by iTunes users who also have that song. What kinds of things they listen to, before/after/around that song, genre and other meta data about the song come into play too.
Unfortunately it doesn’t seem to work on some of the even slightly esoteric bits of my small music library. Pity.

Yeah, I was pretty disappointed with that too. I have lots of music that it can’t help me with. And of course, the converse is that it will only recommend stuff from it’s own mainstream library. I was hoping it would be more inclusive of the iTunes community’s music libraries.
Tim
November 20th, 2008
Oh, come on. This is just the first release of Genius. Give it another rev or two before expecting too much out of it. I’m just happy to be able to easily create playlists that are “safe” for doing stuff like playing in the background when we have people over
Lori
November 20th, 2008