Elementary schools teach us that humans have five senses. Later in life, depending on who you believe, it turns out that there may be many more. Proposed additions to the original five seem a bit dubious—is hunger really a sense, or are you just bored?—but five make the list every time. One of those is our ability to perceive sound. And we do more than perceive it. We seek out noises that are pleasing to us. First came singing, then someone invented the piano, and now we have supercharged V-8 engines. Progress.