The brain is the most complex biological assembly we know of. Its 80 billion neurons—nerve cells—communicate with each other to make trillions of connections, more that the number of particles in the known universe. These connections give rise to the sum of our experiences: all of our thoughts, desires, and beliefs; our emotions, changing moods, memory, even our heart rate and the contents of our dreams. How does this funny-looking, folded-in-on-itself, three-pound tangle of wires and blood vessels do all this, as well as orchestrate the complex interplay between emotion, memory, sound and healing that comes from music? And how does it allow us to remember music that we like, make playlists, and party likes it 1999?
-Daniel J. Levitin, I Heard There Was A Secret Chord: Music as Medicine
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