Try to sing up the scale of notes into a pipe, and you’ll find certain notes are impossible to sing. WHY?!
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Prof Joe Wolfe’s acoustics website: http://newt.phys.unsw.edu.au/music/
Intro chapter on the voice: http://www.animations.physics.unsw.edu.au/waves-sound/human-sound/index.html
Wade et al paper on soprano singing through resonances: https://asa.scitation.org/doi/abs/10.1121/2.0000354
More on vocal tract resonances: http://newt.phys.unsw.edu.au/jw/soprane.html
More facts: Most objects have a number of different resonant frequencies. The first resonance of the pipe were were using was around 70 Hz, which was lower than any of us could sing. A bass singer could hit that note, but were were singing in the range of the second and third resonances of the pipe.