music21 v3 (3.1.0)

Version 3 of music21 is here! This is the first major release in 11 months, with nearly 600 commits since the last version. As a new major version, there are both huge new features as well as significant (often backwards incompatible) changes.

For complete details see:
http://music21-mit.blogspot.com/2016/08/music21-v-3-released-310.html