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In music, the acoustic scale, overtone scale, Lydian dominant scale, Lydian ♭7 scale, or the Pontikonisian Scale is a seven-note synthetic scale.
This differs from the major scale in having an augmented fourth and a minor seventh scale degree. It is the fourth mode of the melodic minor ascending scale. The term "acoustic scale" is sometimes used to describe a particular mode of this seven-note collection and is sometimes used to describe the collection as a whole.
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