Weird key change

• Apr 30, 2022 - 06:24

Okay, I'll be the first to admit that I may be a little over my head working with a full orchestral score. Initially, everything is as it should be. Key is concert G major. Flutes, oboes, violins, etc. have one sharp. Clarinet and Trumpet in three sharps. All expected.
At the eighth measure, suddenly, there appeared a double bar, and a kind of key change. All instruments are in their original keys except the oboes. They are now in the key of C; the sharp has become a natural.
Is it something I inadvertently did? If so, what did I do and how do I undo it? Or is it just some funky glitch I can ignore?


In reply to by Cynewulf

It's a "feature" of MuseScore that if you select only a single note instead of a full measure before clicking the desired key signature in the palette, it only applies to that staff. This was intended as a way to allow mid-measure key changes. But it's definitely led to people accidentally getting one staff in a different key than others. Perhaps somehow this happened. Also, Ctrl+clicking a key signature will also apply it to just a single staff, but that's not something you're likely to do by accident.

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