A heptatonic scale is a musical scale with seven pitches per octave. Among the
most famous of these are the diatonic scale, C D E F G A B C; the melodic minor
scale, C D E(flat) F G A B C ascending, C B(flat) A(flat) G F E(flat) D C descending;
the harmonic minor scale, C D E(flat) F G A(flat) B C; and a scale variously known
as the Byzantine, Hungarian, gypsy, or Egyptian scale, C D E(flat) F(sharp) G A(flat)
B C. South Indian (Carnatic music) classical theory postulates seventy-two
melakarta, seven-tone scale types, whereas Hindustani classical music postulates
twelve or ten (depending on the theorist) seven-tone scale types collectively called
thaat.
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