The harmonic scale is a "super-just" musical scale allowing extended just intonation, beyond 5-limit to the 19th harmonic (), and free modulation through the use of synthesizers. Transpositions and tuning tables are controlled by the left hand on the appropriate note on a one-octave keyboard.
For example, if the harmonic scale is tuned to a fundamental of C, then harmonics 16–32 are as follows:
Some harmonics are not included: 23, 25, 29, &amp; 31. The 21st is a natural seventh above G, but not a great interval above C, and the 27th is a just fifth above D. 
It was invented by Wendy Carlos and used on three pieces on her album "Beauty in the Beast" (1986): "Just Imaginings", "That's Just It", and "Yusae-Aisae". Versions of the scale have also been used by Ezra Sims, Franz Richter Herf and Gosheven.
Number of notes.
Though described by Carlos as containing "144 [= 122] distinct pitches to the octave", the twelve scales include 78 (
 ) notes per octave.
Technically there should then be duplicates and thus 57 (
 78 − 21) pitches (21 
 ). For example, a perfect fifth above G (D) is the major tone above C.
References.
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