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

CLEF

(Commercial Licensed Evaluation Facility) A facility licensed by the U.K. government that performs formal security evaluations of information technology.
References in periodicals archive ?
For the two-gamba edition, they provide two performing scores showing both gamba parts--one score uses the original treble clef notation for the upper instrument, to be played one octave down, and the other provides an alto clef option for the tippet line.
For example, "C 3" refers to the third piece in Charteris's catalogue "Deus Deus meus ad te," while "C3" designates the alto clef.
When notated in soprano clef in the source, the alto is transcribed in treble clef; when it is originally in mezzo-soprano clef, it is transcribed into alto clef by Tyler (with a tenor viol player in mind) and into treble clef by Hanley (with perhaps a score reader in mind).
A few, however, have trio texture, and two of the concerts are recommended for two viols, the upper part being notated in alto clef, although even here Couperin allows for the possibility of performance on other instruments.