Show the results of all possible selections of up to MAX_OPS NRTs acting on D minor. Very slow after MAX_OPS = 4.

NRTChart.py

import music21
import itertools

MAX_OPS = 6

c = music21.chord.Chord('D4 F4 A4')

display = music21.stream.Stream()

LRPcombs = music21.analysis.neoRiemannian.LRP_combinations

for i in range(MAX_OPS +1):
  for chain in itertools.product('LRP', repeat=i):
    c_working = c 
    measure = music21.stream.Measure()
    measure.repeatAppend(c, 1)
    c_working = LRPcombs(c, "".join(chain))
    c_working.lyric = "".join(chain) 
    measure.repeatAppend(c_working, 1)
    display.append(measure)

display.show()