Any iTunes gurus out there? And if so, do you understand how Genius works? A friend was noticing that Genius wasn't available for the classic 1976 Fleetwood Mac track "Rhiannon" (Brent, some of us still listen to Fleetwood Mac!). I thought it might be because the album he had wasn't on iTunes, but we had "Greatest Hits" which is available on iTunes. We couldn't start a Genius with that track either, but we could with another song from the same album.

Soo . . . is it just that nobody else ever created a playlist and transmitted their personal data freely to the Genius servers, or . . . how does that work exactly?