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A pentatonic scale is a musical scale with five notes per octave.
A Chromatic scale starting from any of the 12 notes, in full, will have 13 half steps.
The Circle of Fifths shows the relationship between the twelve tonnes of the chromatic scale. The chromatic scale is related to musical instruments.
A major scale and its relative minor scale share the same key signature.
The least common factor of any set of numbers is 1.