A Dictionary of Music and Musicians/Chiavette
CHIAVETTE (i.e. Little Keys, or Clefs). Under this name, the acute Clefs were used, by the Polyphonists, for certain Modes of high range, such as Modes VII, and XIV; while those of more moderate pitch were used for Modes I, III, or VIII, and others of like extent; and the graver forms for the lowest Modes in use such as Mode XIV transposed. The Clefs of moderate pitch were called the Chiavi or Chiavi naturali, and both the acute and the grave forms, the Chiavi trasportati; but the term Chiavette was generally reserved for the acute form only.
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