http://www.morecowbell.dj/
Allows users to upload and share MP3 files whilst automatically mixing in variable amounts of cowbell and Christopher Walken (voice samples). User creations are shared publicly and media players can be embedded in web pages. Built using The Echo Nest Analyze API , audio analysis tool. “It takes an MP3 as input and generates an XML file which describes the track’s structure and musical content (including rhythm, pitch, and timbre). All information is accurate at the sub-millisecond level.” See http://the.echonest.com/analyze/