From Music Hack Day
Free(CC)it! is a revolutionary intelligent music system that frees any copyrighted music from their authors rights. You just have to select a song and Free(CC)it! will create a license-free version for you to use anytime anywhere! Free(CC)it! rebuilds any song using Creative Commons content from Freesound. Free(CC)it! is the future of music!
We hope to make it available online soon!
 Used APIs and stuff
The core of Free(CC)it! is based on analysis information coming from the The Echonest API and ESSENTIA (audio feature extractor). Once a song is selected, it is chopped in small chunks using beat position information coming from Echonest. All these chunks are analyzed with ESSENTIA and then some content based searches are performed with Freesound API to obtain similar samples to the different chunks. For each chunk we obtain several samples resembling lowlevel similarity, pitch similarity and tonal similarity. Then, all the sounds are assembled to create an amazing new and free of licenses piece of music!
 Sound examples
You have to mix all three streams of each song to have the complete experience!
Reconstruction of a song by the band Mobystick () Key stream:  Lowlevel stream:  Pitch stream:  Reconstruction of a song by the band Ix! () Key stream:  Lowlevel stream:  Pitch stream: 
Free(CC)it! has been developed during the Musich Hack Day at Sonar Festival in Barcelona (2012) by Frederic Font (firstname.lastname@example.org) and Stelios Togias (email@example.com) (MTG-UPF).