Definitions of tuning terms
© 1998 by Joseph L. Monzo
All definitions by Joe Monzo unless otherwise cited
comma
One of several small
intervals with a size of about
an "eighth-tone" [= 0.25 Semitone = 25 cents]. They
occur in a system of just-intonation,
or when considering intervals as ratios.
The three commas which are most commonly encountered
are the Syntonic, the
Pythagorean, and the
Septimal.
When used unqualified, it generally refers specifically
to the Syntonic Comma.
see also
anomaly
[from Joe Monzo, JustMusic: A New Harmony]
(Greek: "cut", "crack" plural: commata)
Any of several small intervals near an eighth of a tone (25¢).
The best known of these are the Syntonic Comma, the Pythagorean Comma (24¢) which is the difference between twelve Perfect Fifths and seven Octaves, and the Septimal Comma (27¢).
[from John Chalmers, Divisions of the Tetrachord]
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