Progressive deafness profoundly influenced Beethoven's compositions, prompting him to choose lower-frequency notes as his condition worsened, scientists have said. 21 December 2011 • 6:30am Beethoven ...
Female zebra finches don't sing but make one-note, low-pitch calls. Males sing over a wide range of frequencies. Scientists discovered how: The males' stronger vocal muscles, not the pressure of air ...
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