> Ibo wrote ... 

Very interesting your points as always Ibo!

Let me just comment on two of them:

1) > > (Claudio wrote) - In the Froberger Vienna entourage the occasional
use of Equal Temperament on keyboards is well documented.
> What is the documentation for the actual use of ET in Vienna.

Do not remember right now, will try and find out. One thing I am pretty
sure: the person who first told me about this was you Ibo in an email some
years ago. Possibly you know the documentation better than myself ... 
:-)

2) > Frescobaldi ... Equal Temperament. ... This has been discussed, but I
haven't seen that Martin Kirnbauer's research (2013) on the matter - 27
years after Barbieri 1986 (which istaken into account by Kirnbauer) - has
been disproved.

I agree with Ibo that we should not re-discuss. Some believe that the
evidence for Frescobaldi's ET claim is the famous letter by Doni, probably
not to be trusted. So just in case I checked again Barbieri (btw. his IL
TEMPERAMENTO EQUABILE NEL PERIODO FRESCOBALDIANO" is dated Ferrara 1983, not
1986). Barbieri specifically mentions musicians in Frescobaldi's milieu
(such as Valentini and Lobkowitz) and his conclusion on p.407 is that (I
translate from Italian): "... it appears that in Rome - starting from
1639 and for at least two decades - the temperament of "equal semitones" was
adopted (on the harpsichord) by a very small but very fierce minority of
musicians, both theoretical and practical."

Will try to find the recent work by Kirnbauer and see to which extent it
disproves Barbieri's 34 pages worth of historical sources and their
analysis.

Best
CDV



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