User:Rua/sandbox

&mid; = gap between two adjacent white notes with a missing black note
 * First and last note have the same colour if there is one gap, different colours if there are two gaps.
 * Major chords: middle note has the same colour as the first note if there is no gap between, different colours if there is a gap.
 * Minor chords: middle note has the same colour as the last note if there is no gap between, different colours if there is a gap.