<p>From the web site:</p><p>music21: A toolkit for computer-aided musicology</p><p>"Music21 is a set of tools for helping scholars and other active listeners answer questions about music quickly and simply. If you’ve ever asked yourself a question like, “I wonder how often Bach does that” or “I wish I knew which band was the first to use these chords in this order,” or “I’ll bet we’d know more about Renaissance counterpoint (or Indian ragas or post-tonal pitch structures or the form of minuets) if I could write a program to automatically write more of them,” then music21 can help you with your work."</p><p>Web site includes links to documentation and authors, tutorials, FAQs, and mailing list.</p>