Chaumont
A meantone temperament; the wolf fifth has been improved
by enlarging the fifths on Eb and Bb. There are six pure
major thirds: F, C, G, D, A, E. The third major on B,
although not very pleasant, can still be used.
Kellner 1975
This tuning was created by Kellner, who figured out its
structure from the symbols on the first page of the
“Wohltemperierte Klavier” by Bach, 1722. The tuning is
based on five fifths, each reduced of 1/5 of Pythagorean
comma. This originates three Pythagorean major thirds, on:
C#, F#, G#. None of the thirds is pure. The major third
closer to being pure is on C.
Kirnberger III
Based on four fifths, each one reduced by ¼ of syntonic
comma, and one fifth reduced of the remaining skisma.
There is only one pure major third on C. From most to least
pure, they are G, D, A and F, Bb, Eb. E, B and F# are
equivalent one with the other. Pythagorean major thirds are
on C# and G#. Pieces with many alterations are well
characterised.
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