List,
 There are at least 2 commas. The comma of Pythagoras - project P5 from say
c-g-d-a-e-b-f#-c#-g#-d#-a#-e#-b# the difference between b# and the c next to
it is the commas of Pythagoras. The projection of P5 never reaches c. The
ratio is 531441:524288 or 24 cents. The commas of Didimus or a syntonic
comma has to do with perfect (harmonic series 3rds) - ratio 5:4 as opposed
to a Pythogarian third - ratio 81:64. There is a book by J. Murray Barbour
called Tuning and Temperment. DaCapo Press-New York 1972
jag

-----Original Message-----
From: Pipe Organs and Related Topics [mailto:[log in to unmask]]
On Behalf Of David Calhoun
Sent: Tuesday, October 24, 2006 11:00 PM
To: [log in to unmask]
Subject: Re: What is a comma?

;Allo - those of us from across the listserv pond at the cognate
hpschd-l welcome the organ side to the endless, endless wrangle
about tunings and temperaments of which so much, some of it even
informative, can be read in the archives Over There.

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