The Echo Nest Remix API lets you manipulate music and video from the web. We've done the following: rearranged the syllables of a vocal line, walkenized and cowbellized hundreds of thousands of songs in a week, mixed up the hits of a drum beat and synced it to another loop, beat matched two songs, split apart DJ mixes by their individual tracks, made new kinds of music, synced a video to a song, transitioned between two covers of the same song, made a cat play piano. We're making this available as an open source SDK for Python that can currently be easily installed for Mac OS X and Linux. It accesses the Echo Nest Analyze API at http://developer.echonest.com seamlessly through a web services interface and parses the results. You'll need an Echo Nest API key to use this SDK.