levels
low
middle
high
meta
features extraction
features imitation
features manipulation
demonstration (2020)
features based on
pp. 63–65: instrumentation
pp. 65–67: musical texture
pp. 67–72: rhythm
pp. 72: dynamics
pp. 72–74: pitch statistics
pp. 75–76: melody
pp. 76–78: chords
Most of them are included in the music21 library.