I've found a new website that makes me smile.
Here's a post of the tech explanation behind this little web app, but to jump straight to the fun part, head to "In Search of the Click Track" to take a look at tempo deviations in your most or least favorite song to determined if it is drummed by Man or Machine.
The Police/Stewart Copeland v. Britney Spears/HAL 9000 is the example used on the main page of the site.
Has some pretty obscure tunes in the database, so throw in an artist and see what you get. The Police, Oysterhead, even some Stewart solo/composition is in there. Plus you can discover fun things like proof that the Army's not the only one on Ecstasy and Neal Peart is a robot.
[The search function is wonky, so try variations (both artist and song title, just artist, just title) to get a better indication of whether or not the song you want is actually in there.]