Harmonic development of melody is defined by per-bar harmonic functions (chord types) sequence. The sequence in it's turn is defined by harmonic structure Sg.

There are four variants for Sg in program:
Sg1 = 1 1 4 5 4 4 5 1
Sg2 = 1 5 1 5 4 4 5 1
Sg3 = 1 4 4 4 1 4 4 1
Sg4 = 1 4 1 5 4 1 5 1

(1 = tonic, 4 = subdominant, 5 = dominant).
Due to harmonic structure there is a division of melody into stable and unstable sounds.

• Supporting notes

• Harmonic structure

• Algorithmization

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