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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clef

Music one of several symbols placed on the left-hand side beginning of each stave indicating the pitch of the music written after it
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

CLEF

(Commercial Licensed Evaluation Facility) A facility licensed by the U.K. government that performs formal security evaluations of information technology.
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