"Thomas Alva Edison listened with his teeth. The inventor of the phonograph was completely deaf in one ear and could barely hear in the other, the result of a mysterious affliction in his childhood. To appreciate a delicate tune emanating from a music player or piano, he would chomp into the wood and absorb the sound waves into his skull. From there they would pass through the cochlea and into the auditory nerve, which would ferry the melody to his prodigious brain. Edison’s approach to music consumption had curious side effects, beyond the visible bite marks all over his phonographs. He couldn’t hear at the highest frequencies, couldn’t stand vocal vibrato, and declared Mozart’s music an affront to melody. But his inner ear was so sensitive that he could dazzle sound engineers by pinpointing subtle flaws in their recordings, such as a squeaky flute key among the woodwinds."