It has reversed my life-long hatred of "Sweet Child O' Mine".
http://musicmachinery.com/2010/05/21/the-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."
Fuck yeah.
