By way of PZ, I just found [the website of Jonathan Coulton](http://www.jonathancoulton.com/songs/), a musician who seems to specialize in humorous and geeky songs. The music is good; the lyrics are absolutely fantastic.
Here’s an example that he gives away, called “Mandelbrot Set”. (For embedding it here, I drastically stripped it from 160K stereo sample to just 16K mono; go to his homepage to get the real, full-quality version.)
Just to give you an idea, here’s the lyrics for the first verse:
Pathological monsters! cried the terrified mathematician
Every one of them is a splinter in my eye
I hate the Peano Space and the Koch Curve
I fear the Cantor Ternary Set
And the Sierpinski Gasket makes me want to cry
And a million miles away a butterfly flapped its wings
On a cold November day a man named Benoit Mandelbrot was born
Go. Listen. Buy!