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Answer: hexachords
Answer	Crossword Clue
hexachords	A musical scale of six notes with a half step between the third and fourth. An overlapping series of seven such scales starting on G, C, and F formed the basis of medieval music theory
hexachords	HEXACHORD, a series of six notes, with a semitone between the third and fourth, the other intervals being whole tones

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.

Answer: hexachords