Author: kdk ★2017
Date: 2016-09-23 02:28
It depends on the composer, unfortunately. Some composers treat an accidental as effective only for the specific octave in which it appears. Others intend it to affect the same note in any octave. When there's a question, you really have to look at the rest of the piece or even other pieces by the same composer to be sure which is meant.
You can look, for example, for a place where a new octave is given a new marking, or a place where the line is so obvious (maybe a straight-up D major scale, that a higher C couldn't possibly be a natural.
In either case, the accidental persists only for the rest of the measure. It has to be renewed after a bar line for as long as it's meant to be in effect.
Karl
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