Foot taps. Head nods. You might smile. Or Cry. You might get goose bumps. You might feel sadness, joy or even reverence. For a second, the face of someone you seldom think about flashes. You close your eyes to get closer. You sing along. Loudly. You feel a kinship with the person now staring from the adjoining car. Surely they approve. They do not. What on Earth is happening to you? Neurologically, you are having a strong emotional reaction to structured sounds. Simply put, you are enjoying music.