How the Brain Evolved to Play and Listen To Music (1:02) This video examines the evolution of human sound making and understanding. Daniel Levitin visits Google's San Francisco, CA office to discuss his book "The World in Six Songs: How the Musical Brain Created Human Nature." This event took place on August 22, 2008, as part of the Authors@Google series. An unprecedented blend of science and art, Daniel Levitin's debut, This Is Your Brain on Music, was an extraordinary success. Now in what is being called a tour de force by his peers, he showcases his audacious theory of "six songs," illuminating how the brain evolved to play and listen to music in six fundamental forms—for friendship, joy, comfort, knowledge, religion, and love. Source: Authors@Google series.