As far as I know, the OMGP keeps this - listen to Pandora, for example, and then click on "why are we playing this song?" or whatever it's called - I don't have it in front of me. It'll list out a list of criteria that it used to choose the song, based on mostly similar criteria from the original song/artist you chose.

All I'd like to do is feed in criteria and get music, not feed in music and get music based on the same criteria.