I remember reading that certain varieties of just intonation offered two Tristan chords. (Of course, Wagner did not originate the chord. Bach used it previously.) As I remember, the notes have the ratios 5:6:7:9 and 1/7:1/6:1/5:1/4. Is that information
correct? Where can documentation be found?
The just versions of these chords have approximations in 19-TET and closer approximations in 31-TET.
What other chords that coincide in 12-TET diverge as tuning changes?
Beco dos Gatinhos
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