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Jan 13, 2021 at 17:27 comment added phoog @octacube "those instruments must be tuned on some base notes that caused the avoidance": the base note of the temperament is not as important as the nature of the temperament itself. Whether you start at A or C or some other note, the temperament will specify that the fifth between (for example) G and D should be (for example) 1/5 of a comma smaller than pure.
Jan 13, 2021 at 17:23 comment added phoog @octacube keep in mind, however, that although a harpsichord can be retempered during a break in a concert, the same is not true of a large pipe organ. This perhaps explains why the individuals who have given their names to temperaments (for example Werckmeister, Kirnberger, Vallotti) are all organists. Also, user1079505, there is quite a lot of detail about these temperaments available in historical texts.
Jan 13, 2021 at 15:27 comment added user1079505 @octacube I'm not sure how much details about temperament can be found in historical texts, but there are communities that study early music and recreate the old instruments; there are entire sections at music universities focusing on that. It's a fascinating topic. Look for publications, or workshops, (or recordings and performances!) or perhaps contact directly these musicians.
Jan 13, 2021 at 14:53 comment added Tim @guidot - I reckon that if the instrument was tunes to, say, D, then keys G and A would be acceptable - but stray to say Bb would be out.
Jan 13, 2021 at 12:02 comment added guidot If I remember correctly, there is a wide range between the single base used for tuning (which of course has to sound perfect) and intolerably out of tune. The closer you remain to the base (in circle of fifths view), the more acceptable the result will sound. So any tuning does not imply restriction to a single key.
Jan 13, 2021 at 4:19 comment added octacube Maybe it’s just a mess and it’s different everywhere...?
Jan 13, 2021 at 4:12 comment added octacube Thank you, that’s very good to know. I wish there are some writings from the past about this somewhere... I’ve read about avoiding some keys/chords as well, that’s why I’m thinking they must be writing for some already tuned instruments, and those instruments must be tuned on some base notes that caused the avoidance.
Jan 12, 2021 at 21:16 history answered user1079505 CC BY-SA 4.0