Dunc's Algomusic is quite an awesome program.

[DSiDewd]

It lets you input words, and it generates a song out of it, sort of how Minecraft generates worlds out of words. http://www.wikihost.org/w/doodleblog/dunc_s_algomusic (Mk IIIb is the one I use.)
I'll post a video of it in action later, using "Buildism" as the seed. (only calling it seed because of my minecraft addiction, plus i dont actually know what the proper term is)

---

There's lag due to Camstudio, but you get the idea.