Maybe someone has already posted this but... very fun.

"I Will Derive!"

Suggest you all check out Klein Four Group - Finite Simple Group of Order Two

YouTube - Finite Simple Group (of Order Two)

Fantastic.

I'm not yet educated enough to get that one entirely, but gotta love the a-Capella. I'll definitely re-visit it once I can get more of the humor.

Here's another one.. "Mandelbrot Set" which I've loved for a while.

YouTube - Mandelbrot Set

(Listen through the credits too!)

And in fact, if you are REALLY a full-spectrum geek and not just a math geek, Jonathan Coulton is a completely fabulous geek musician I highly recommend... Jonathan Coulton