A play that will take a long time I can search one up
I think this is what you wanted for an answer!..
The answer among these works that features a flute with a delicate, "breathy" sound in a relatively high register is Concerto for Orchestra by Bela Bartok.
Answer:
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Short answer-half note.
In common time the quarter note equals one beat, and there are four quarter notes in a measure.
Songs in alla breve contain two beats per measure, with the half note equaling one beat. That means that the time signature of the alla breve is represented as 2/2 (not 4/4 as common time is).