Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
The way I understand it is that the difference between the keys is related to the root.  If you tune perfect fifths and accurate major thirds to C, it'll have an effect on pieces in F# minor.  If you tune them to F, then whatever note relates to F the way F# relates to C (C?--the raised fourth!) will have (if I've understood correctly) the same feel in relation to the root.  So when the composers talked about the feel of a key, it would always be in relation to C as the root and then the various tuning mechanisms brought out different flavours as the key varied.

With the advent of synthesisers, any relationships can be created and then re-created in realtime as preferred, so the idea of G having a particular feel makes no sense--all the relationships sound the same and as you say, C has moved around so it can't be a strict pitch thing.

With instruments, though (again, if I've understood it right), there do exist notes that are better for the structure--trumpets and trombones are built around specific tones; strings sound different if you tune them more than a tone above or below--the tensions are noticeably different--

If I say I like Es on electrics and Ds on an acoustic, I think that means the way the strings resonate when held down in those patterns with those instruments--

What intrigued me when I played on the harpsichord is that different keys did seem to have a different feel; what Robert has pointed me to and said about temperament made me think that tuning harpsichords a certain way around C does give keys specific flavours--

I came to Bach via the sound of the piano, so the Well-Tempered Clavier had a different meaning to me; the various keys didn't matter much, they just mean playing from different starting points; but I think there are probably lots of enjoyable things Bach was doing for the player and listener that can only be heard when played on correctly tempered instruments.

Don't fight forces, use them R. Buckminster Fuller.

by rg (leopold dot lepster at google mail dot com) on Sat May 3rd, 2008 at 07:40:37 PM EST
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