Various tunes I've been extracting clips from for use as ring tones*. Everything from The Prodigy's "Voodoo People" to the theme from Dangerman.
* Hours of fun with the Audacity utility.
BTDTGTTS, spent far too long working out optimum length of clip* then finding suitable source material**.
* 9 seconds
** my favourites being the opening bars of "the MAn Who Sold The World" from Nirvana Unplugged, and the chorus from "New Breed" by Fear Factory.