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I’ve heard “pear-shaped sound” ever since the 1950s, initially by a music teacher when I was in on elementary school. The dictionary says orotund, which means full and round.
Whether round or shaped like a Seckel, how does a sound have a geometric shape? On an oscilloscope, it’s a line, not a closed loop. How long has this terminology been around, and where did it come from? Dictionaries don’t seem to ever have etymologies except for the primary definition.
This reference dates it back to the bel canto school, which I take to be mid-1800s.