I've always been a fan of classical music, ever since I got hooked (pardon the pun) on "Hooked on Classics". So what a kick it was to see this video, in which the "Can Can" song is performed by the sounds of Super Mario Brothers.
I figured that there must be other examples or songs out there, and came across several songs that were "composed" via the Mario Paint Composer, including a portion of Beethoven's Fifth Symphony:
Speaking of "Hooked on Classics", here's the original track from that album, done again in Mario Paint Composer:
Lastly, this isn't "classical" in the literal sense of the world, but "classic" in terms of geek culture - it's the opening theme from Pee-Wee's Big Adventure, music by Danny Elfman:
Keith Shaw rounds up the best in geek video in his ITworld.tv blog. Follow Keith on Twitter at @shawkeith. For the latest IT news, analysis and how-tos, follow ITworld on Twitter, Facebook, and Google+.