From the traditional perspective of composing/songwriting or performance using acoustic instruments, this would probably seem useless. But there is a whole world of folks obsessed with coding music and instruments, check out Chuck, CSound, Max/MSP or Supercollider (which this uses as it's audio backend).

I like to think of projects like this as experimentation in technology-as-art. Even if the sound itself isn't what I would use to write songs, I still find it very satisfying to watch someone write out Lisp/Clojure code and hear organized sound come back. And I'm sure that is amplified by a million for the person who actually created this themselves!