clef(redirected from Mezzo-soprano clef)
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clef,in music: see musical notationmusical notation,
symbols used to make a written record of musical sounds.
Two different systems of letters were used to write down the instrumental and the vocal music of ancient Greece. In his five textbooks on music theory Boethius (c.A.D. 470–A.D.
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Music one of several symbols placed on the left-hand side beginning of each stave indicating the pitch of the music written after it