Brian McFee brought the heavy lifting to the Toronto Music Hack Day. His goal – to see what it would sound like if Billie Holiday sang for Black Sabbath or if Kenny G and The Jesus Lizard formed a supergroup. To do this he built the FRANKENMASHER 2000. This program uses some heavy math to separate the vocals from one song and the instrumentation of another to combine them into what he calls a ‘horrible abomination of sonic torture’. Here are some examples:
Brian has a blog post that describes a bit of the math involved and has more examples. If you are into MIR, Brian’s the guy to keep an eye on. He’s doing interesting things.