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The "tonic" or "dominant" (terms perhaps not applicable to chromatic scales, but used for ease of reference) letter names of the scale are written once each, and all other letter names are written twice. For example,

C harmonic chromatic is: C, Db, D, Eb, E, F, F#, G, Ab, A, Bb, B, C

D harmonic chromatic is: D, Eb, E, F, F#, G, G#, A, Bb, B, C, C#, D

(Of course, strictly speaking the tonic is actually written twice: once at the bottom and once at the top.)

I believe the rationale behind the harmonic chromatic scale is to create a "key-related" chromatic by "layering" the major and minor scales together, then adding the b2 and #4 to complete the set (so to speak). That is why it is important that the tonic and dominant are not repeated.

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12y ago

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