This piano piece was created by assigning notes to the digits 0 through 9 in the constant known as pi. Pi has no repetitive patterns, so the piece sounds random, but has a mathematical beauty all its own. Link -via Everlasting Blort
my boyfriend had to do something similar for his modern poetry class - he assigned different words to the numbers, and then wrote out the words for the first 100 digits of pi!
You can choose what scale you want to use or assign your own notes to it.