Author: kdk ★2017
Date: 2013-09-23 00:21
There's nothing sacrosanct about a key signature. Some composers don't even use them, and their music isn't necessarily always in C Major or A minor (or D Dorian, etc...). The key center of a piece often changes, especially between parallel or relative major and minor keys.
But, rmk54, I won't argue with you. We probably can't convince each other.
And if I'm actually wrong about the local key center, which I've only guessed at *because* of the B-flats (I have never heard nor played the piece), then my answer will change. If there are F-sharps and C-sharps (or their concert pitch equivalents) in other voices and the B-flats (concert A-flats) are chromatic alterations, then at the very least, the E must trill to F-sharp. The A in that case may trill to B-natural to cause a deliberate cross-relation between the prevailing harmony (key) and the B-flats in the figure (or not).
Probably the best person to ask is the conductor in any case. Unless Johnny wants to argue with him, then objective right or wrong probably is irrelevant to the situation - the conductor gets the last word.
Karl
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