Low notes create wide grooves, high notes create narrow grooves, and a needle dropped inside the grooves is moving thousands of times per second to capture the landscape of the inner wall. If a person knew many pieces of music well, it would be possible to characterize them in terms of how many low notes there were (rap music has a lot, baroque concertos don’t), how steady versus percussive the low notes are (think of a jazz-swing tune with walking bass as opposed to a funk tune with slapping bass), and to learn how these shapes are encoded in vinyl. This fellow’s skills are extraordinary, but
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