>Can anyone tell me- why were tierces included
> in chorus mixtures in past eras?
My experience has been that these mixtures were very carefully voiced
and added just a tinge of reediness to the chorus without being
offensive.  They are certainly beautiful IMHO.
 
> the National Shrine Kilgen has a III rank
> Carillon in the Choir division. It's pitches (I
> believe, without the specs right in front of me)
> are 2-2/3', 1-3/5' and 1'.
The Harrison Skinner at Christ Church Cathedral--Houston TX has a
Terzian II or III on the Positive.    I believe it is pitched an octave
higher than a sesquialtera.    It adds a wonderful bell-like line,
especially when used with the Cymbale III.   It enjoyed it very much,
and don't recall it being overbearing at all.  It is primarily intended
as a chorus mixture, according to my ears.
 
.......................bruce  cornely........................
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