Tetrads of meantone
Here are tetrads of meantone along with 7-limit interpretations.
It would be interesting to know more about when and by whom some of
these were used in common practice harmony.
Dominant seventh C-E-G-Bb 1-5/4-3/2-16/9 = 1-5/4-3/2-9/5
German sixth C-E-G-A# 1-5/4-3/2-7/4 major/otonal tetrad
Swiss sixth C-D#-G-A# 1-7/6-3/2-7/4
French sixth C-E-F#-A# 1-5/4-10/7-7/4
Added sixth C-E-G-A 1-5/4-3/2-5/3
Tristan/half-diminished C-Eb-G-Bbb 1-6/5-3/2-12/7 minor/utonal tetrad
"Mozart tetrad" C-Fb-G-Bb 1-9/7-3/2-9/5 supermajor tetrad
"Subminor tetrad" C-D#-G-A 1-7/6-3/2-5/3 subminor tetrad
Incomplete dominant 9th/minor added sixth C-Eb-G-A 1-6/5-3/2-5/3
Diminished seventh C-Eb-Gb-Bbb, C-Eb-Gb-A, C-Eb-F#--A, C-D#--F#-A
Major seventh C-E-G-B 1-5/4-3/2-15/8
Minor seventh C-Eb-G-Bb 1-6/5-3/2-9/5
"Meanpop sixth" C-Eb-G-A# 1-6/5-3/2-7/4, the (7/4)/(6/5) = 35/24
interval is a meanpop 16/11.