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Re: Intervals enharmony question

From: David Kastrup
Subject: Re: Intervals enharmony question
Date: Mon, 30 Apr 2018 21:22:52 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

Wols Lists <address@hidden> writes:

> On 30/04/18 14:50, Hans Åberg wrote:
>>> On 29 Apr 2018, at 22:17, Jacques Menu Muzhic <address@hidden> wrote:
>>> OK, now everything is clear, it’s precisely on jazz chords I’m working.
>> FYI, I recall the Mehegan books on jazz improvisation applying
>> enharmonic equivalents freely. The Blatter books on instrumentation
>> suggests applying them to simplify for harpists, which will save
>> time and money. But orchestral instruments depart from Pythagorean
>> tuning, not E12, so they are not equivalent, differing by a comma of
>> about 20 cents.
> Which actually matters how?
> Apart from the violins and the trombone, most instruments just play the
> pitch to which they are tuned, so Bbb and A are the same fingering, and
> the same note.

Not using the correct pitch "spellings" means that the chord stackings
lose their "functional" character.  You stop being able to see at a
glance whether there is a seventh or a sixth, for example.  That's bad
on an instrument like the piano since you lose the connection between
the expectation of a particular sound and its execution, and it's worse
for an instrument like the accordion where particular chords are
produced by pressing particular buttons, like Cmaj7 as c (major) and em.
If you cannot see the function of a chord, figuring out the button
combinations is close to impossible.

David Kastrup

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