Echo Nest Remix lets you remix, re-edit, and reimagine any piece of music and video, automatically and algorithmically. Remix has done the following: played a song forever, walkenized and cowbellized hundreds of thousands of songs in a week, reversed basically everything, beat matched two songs, split apart DJ mixes by their individual tracks, made new kinds of video mashups, corrected sloppy drumming, synced video to a song, transitioned between multiple covers of the same song, made a cat play piano, and made it swing. Remix is available as an open source SDK for you to use, for Mac, Linux, and Windows: Install for Python: sudo pip install remix. Full installation details, packages for Mac and Windows, and complete Python documentation are here. Try JavaScript: Test out remix.js here. Download JavaScript: remix.js. Full JavaScript install details and documentation are here - scotu