dj BC sez, "Tristan Jehan from M.I.T. has created a unique and simple music hack, which my buddy Solcofn stumbled across on Paul Lamere's excellent 'Music Machinery' blog."
One of my favorite hacks at last weekend's Music Hack Day is Tristan's Swinger. The Swinger is a bit of python code that takes any song and makes it swing. It does this be taking each beat and time-stretching the first half of each beat while time-shrinking the second half. It has quite a magical effect.
Check out the examples from the likes of The Police, Daft Punk, Metallica, and Prince.
(Thanks, dj BC!)