An interesting thing.
- take altered chord -
X7#9 - its interval class histogram is
111111{1: 1, 2: 1, 3: 1, 4: 1, 5:1, 6:1}
- it contains each interval class exactly once
- interval class
- the shortest distance between two tones on the 12-tone circle
- range: 0-6
- in the above example we omit the unison (interval class 0)
- however it is trivial to add it and the histogram's property keeps holding