The Swinger « Music Machinery
http://musicmachinery.com/2010/05/21/the-swinger/

Swinger uses the new Dirac time-stretching capabilities of Echo Nest remix.

fun software hack that takes any song and makes it swing...with examples

Stretches the first half of each beat and shrinks the latter. Via http://twitter.com/nondisbeliever

HOLY SHIT! 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.