Have you ever listened to a swelling orchestral crescendo or a powerful vocal high note and suddenly felt a wave of chills travel down your spine? This intense, shivering sensation, often accompanied by goosebumps, is known as "musical frisson." It is one of the most profound, yet neurologically perplexing, human reactions to sound.From a strict evolutionary standpoint, getting goosebumps when hearing a song makes absolutely no sense. Piloerection-the raising of body hair-was designed to make our hominid ancestors look larger to predators or trap body heat during sudden drops in temperature....