Add Scales

[TomChamberlainUK]

Add the following scales:

• [x] Chromatic, or dodecatonic (12 notes per octave)
• [ ] Nonatonic (9 notes per octave): a chromatic variation of the heptatonic blues scale
• [ ] Octatonic (8 notes per octave): used in jazz and modern classical music
• [ ] Heptatonic (7 notes per octave): the most common modern Western scale
• [ ] Hexatonic (6 notes per octave): common in Western folk music
• [ ] Pentatonic (5 notes per octave): the anhemitonic form (lacking semitones) is common in folk music, especially in Asian music; also known as the "black note" scale
• [ ] Tetratonic (4 notes)
• [ ] tritonic (3 notes)
• [ ] ditonic (2 notes): generally limited to prehistoric ("primitive") music

[TomChamberlainUK]

Consider how these are broken down per types of scale, eg. these are all examples of Heptatonic scales:

• the diatonic scale; e.g., in C major: C D E F G A B C—and in the relative minor, A minor, natural minor: A B C D E F G A
• the melodic minor scale, A B C D E F♯G♯A ascending, A G F E D C B A descending
• the harmonic minor scale, A B C D E F G♯A
• the harmonic major scale, C D E F G A♭B C.

[TomChamberlainUK]

Also consider correctly labelling notes with sharps and flats to ensure letters only appear in scales once