windchime is a generative music system that adds another dimension to the act of composing written text, whether it be software or English.

(see a video of this)

Download a binary from the downloads page - it works on OSX 10.7+. You'll need to enable assistive devices:

It's initially aimed at 'coding' and thus pulls together word-painting tropes like having a [ start a phrase and ] sound a cadence.