Explaining how accidentals work in a measure🎵 #banddirector #musicteacher

Added: 2026-05-17

[00:00:00]So, number 60, we're in concert B flat.

[00:00:02]The composer wants a D flat. That D flat is not in the key, so that's why they wrote the accidental. And they did not write flat again on the second note because there's a musical rule that the accidental stays for the entire measure.

[00:00:16]And then once it passes the measure line, it goes back. And that is why they put a flat [music] again. So, this is D flat. This is also D flat even though there's no flat sign next to it because it fits in the musical rule that it stays for the entire measure. And that's why when you leave the measure, it has D [music] flat again because the composer wants D flat there. It does not have the little flats here because it fits in the musical rule, and those are all D flats.

[00:00:44]All right. So, there is some little notes. Hopefully, that helps somebody.