The Echo Nest: Musical Brain API
The Echo Nest develops music search, personalization and interactive applications based on their Musical Brain technology. The Musical Brain automatically reads about music and listens to music everywhere on the web. Their API allow you to upload any song and receive an XML ‘musical score’ detailing tempo, beats, time signature, song sections, timbre, key, and other musical attributes.
Their application This is My Jam allows you to search for artists and reate beat-matched micro-mixes of your favorite songs to share on blogs and social networks. Imagine the possibilities.
Try it: http://www.thisismyjam.com/
