Music21 v7.3.3 - Google Colab MIDI
Music21 7.3.3 adds support for showing MIDI inside a Google Colaboratory (colab) notebook, via music21j. Since m21 v8 will be Python 3.8+ only, and Google Colab is still on Python 3.7, a back-port to v7 was needed.
7.3.2 was internal development only and not released
7.3.1 fixed a bug that made some installations of v7.3.0 fail, and fully replaced the 7.3.0 branch, which, as Apple would say, is now "unsigned".