def make_chromatic(key):
'''Makes a chromatic array of notes starting from the specified key'''
# pre-calculate the forward and backward ranges
# needed to build the chromatic scale
fr = range(key.distance, 12)
br = range(0, key.distance)
notes = [Notes.by_distance(i) for i in fr]
notes.extend([Notes.by_distance(i) for i in br])
return notes
