c,d,,d#,e,f,f# -> 0,1,2,3,4 : note indexes
i,ii,III, etc: scale degree
Cm = chord
Cm4 = midi chord
C = note
C5 = midi note

c,d,,d#,e,f,f# -> 0,1,2,3,4 : note indexes
i,ii,III, etc: scale degree
Cm = chord
Cm4 = midi chord
C = note (see https://en.wikipedia.org/wiki/Pitch_class)
C5 = midi note

Add link to pitch class
Add link to pitch class
