Whether you load your iPod with Bach or Bono, music has a significant role in your life-even if you never realized it. Why does music evoke such powerful moods? The answers are at last becoming clear, thanks to revolutionary neuroscience and the emerging field of evolutionary psychology. Both a cutting-edge study and a tribute to the beauty of music itself, 'This is your brain on music' unravels a host of mysteries that affect everything from pop culture to our understanding of human nature. This book explores cultures in which singing is considered an essential human function, patients who have a rare disorder that prevents them from making sense of music, and scientists studying why two people may not have the same definition of pitch.