Register is what you call the playing a new set of notes on top of the old. A flute, clarinet, recorder and saxiphone can play more notes than the amount of keys they sport. Playing the higher octave, or register, can either simply be with the release of a key (or half a key) or might include different blowing methods, which makes it harder. I don’t think it is called register on a trumpet, but I’m not sure.
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