We present Bach's Chorale Jesus bleibet meine Freude, arranged for two organs and tuned into Semi-Just intonation, centered around G.
"Semi-Just intonation" is a generic umbrella name for systems constructed by expanding some just chords in a given tonality.
In this case, the structure by fifths of the tuning is the following:
Bb Just F
F Quarter-comma C
C Just G
G Just D
D Third-comma A
A Third-comma E
E Third-comma B
B Quarter-comma F#
F# Just C#
C# Just G#
G# Just D#
D# 710.75 ¢ Bb
The G-major triad is just.
The other main triads happen to be tuned in this way (intervals from each root are displayed, figures are in cents):
F 0.00 A 0.00 E 0.00 D 0.00
A 395.27 C 301.30 G# 395.27 F# 380.94
C 696.58 E 694.79 B 694.79 A 694.79
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