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Why are major and minor scales called heptatonic scales?
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The universality and innate nature of music, and the pentatonic scale, as demonstrated by singer Bobby McFerrin.
Major and minor scales are classified as heptatonic scales because they are composed of seven distinct tones within an octave.12
The term "heptatonic" is derived from the Greek prefix hepta-, meaning seven. In the context of Western art music, these scales are fundamental to the diatonic system, which organizes these seven pitches into specific patterns of whole and half steps. While major and minor scales are the most recognizable examples in Western music, the heptatonic classification applies to any musical scale that utilizes seven different pitches, including various non-Western systems and historical church modes.31