These mp3z have been grouped together based upon their acoustic similarity.

We never looked at the file names or ID3 tags, only the audio signal itself.

While imperfect, this technique shows great potential for working with user generated content.

The first track is the seed, the rest are in order of similarity to the first.

Check out these playlists of mp3s that are similar to:

• Afrika Bambaataa - Planet Rock
• Coldplay - The Scientist
• Fiona Apple - Across The Universe
• Ramones - I Wanna Be Sedated
• John Lennon - Imagine
• Red Hot Chili Peppers - Scar Tissue

These recommendations were created by analyzing the audio signal of each track in our collection. No metadata or ratings information was used in this analysis. We looked at playlists from the 500 most popular playlist authors at Webjay and analyzed over 25000 audio tracks using MARSYAS, an open source software framework for audio processing.

For each track, we downsampled the audio signal and converted a 30 second chunk into 24 different audio features.

Recommendations are based upon a "source track", which is the first track which appears in the playlist. The tracks that follow it are the closest vectors in the audio feature space.