Have you seen the 'infinite jukebox'? http://labs.echonest.com/Uploader/index.html http://labs.echonest.com/Uploader/index.html It stretches or compresses exi

Have you seen the 'infinite jukebox'? http://labs.echonest.com/Uploader/index.html http://labs.echonest.com/Uploader/index.html It stretches or compresses existing music by jumping back and forth to parts of the piece that sound similar, which could be handy for dynamically adapting the timing/duration of existing pieces to the players situation.