Delta scale



The δ (delta) scale is a non-octave repeating musical scale. It may be regarded as the beta scale's reciprocal since it is, "as far 'down' the (0 3 6 9) circle from α as β is 'up.'" As such it would split the minor second into eight equal parts of approximately 14 cents each. This would total approximately 85.7 steps per octave.

The Bohlen–Pierce delta scale is based on the tritave and the 7:5:3 "wide" triad and the 9:7:5 "narrow" triad  (rather than the conventional 4:5:6 triad). Notes include:
 * 1:1
 * 25:21
 * 9:7
 * 75:49
 * 5:3
 * 9:5
 * 15:7
 * 7:3
 * 25:9
 * 3:1