Sound affects the body mechanically, neurologically, and emotionally. Sound waves physically vibrate the eardrums, which the inner ear translates into electrical signals for the brain. These signals trigger immediate neurological responses, releasing neurotransmitters like dopamine that influence heart rate, breathing, and mood, while loud noises can physically damage inner ear hair cells.
"Music has charms to soothe a savage breast". -William Congreve in his 1697 play The Mourning Bride
Ever get a song stuck in your head? It can be annoying sometimes, like when you're trying to sleep and a few song lyrics just keep repeating in your head. Not the whole song, just a line or two, enough to be frustrating and keep you awake longer. Then you have to think of another song to hopefully replace that one and let you finally fall asleep.