generate your own computational ringtone
The WolframTones site allows you to generate your own ringtone in various musical styles by taking simple programs from Wolfram's computational universe, and using music theory and Mathematica algorithms to render them.
This comes from the work of Stephen Wolfram, author of A New Kind of Science. The site is an exercise of midi-math which basically means that the quality of the sound could be better, but it also means that you can easily send your generated composition to your phone and use it as a ringtone.
Access WolframTones here.