Shallow Gene Pool at the Music Genome Project?

While I did create a “Glycerine” channel, I’ve heard an acoustic rendition of Bush’s Glycerine at least 5 times now on my Ani Difranco channel, and I haven’t listened that much to Pandora.

I don’t know if I ran into a flaw in the algorithm, have had strange luck, or if Pandora isn’t really all that amazing…