contenance_angloise.py – module to run tests on the percentage of sixths etc. to test theories about
the contenance angloise in 14th and 15th century music
Finds instances of melodic Perfect fifths or Fourths (a harmonic version should also be made)
to see if the B-F# fifth/fourth is actually less used than other common fifths when adjusting
for the % of notes that are B or F#.