We used The Echo Nest API and some information from a local copy of the musicbrainz server. Data was downloaded during December 2010. For more information on how we chose the tracks, see How did you choose the million tracks?.
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We used The Echo Nest API and some information from a local copy of the musicbrainz server. Data was downloaded during December 2010. For more information on how we chose the tracks, see How did you choose the million tracks?.