I suspect it’s something to do with sounds waves so have flaired as physics, but not sure?
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Not all singers are singing the same notes. This leads to a concept called “interference”. Sound travels in a wave, picture a wave on the ocean. If two waves are moving in the same direction they will move together and grow into a bigger wave. Meanwhile. If two waves travel opposite each other they will cancel out. The same thing happens with sound waves. In the case of a choir you will have 10 people singing one section of the song those are 10 little waves merging to form a large wave but when they collide with 10 other people signing another section of the song some of the noise gets dampened.
This video explains it well. The super abridged version is the first 25 seconds
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