Tetrachord - Permutations

Permutations

The three permutations of this shade of diatonic tetrachord are:

Lydian mode
A rising scale of two whole tones followed by a semitone, or C D E F. (same hypatē and mesē for the ancient Greeks)
Dorian mode
A rising scale of tone, semitone and tone, C D E♭ F, or D E F G (E to A for the ancient Greeks).
Phrygian mode
A rising scale of a semitone followed by two tones, C D♭ E♭ F, or E F G A (D to G for the ancient Greeks).

(The extents of the Greek system are from Chalmers, Divisions of the Tetrachord.)

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