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Online music developers and Pandora and Last.fm lovers, take note. The next phase in research on how to deliver smart music delivery systems is underway, facilitated by a Million Song Dataset just released by The Echo Nest music application company.
The dataset is "freely-available collection of audio features and metadata for a million contemporary popular music tracks," being analyzed by Columbia University's Lab ROSA, aka the Laboratory for the Recognition and Organization of Speech and Audio. And the Holy Grail is to use this treasure trove to develop a new generation of Music Information Retrieval services—venues that pay attention to what you are listening, analyze the components, and offer up new songs and compositions that you'll like.
And that "freely available" bit means that you can download the dataset here.