Daniel Levitin, Psychologist, said "We are using music to better understand brain function in general,"(Landau, 2013) One component to this is music's effect on stress levels; calming music reduces levels of cortisol in humans and aids in concentration, and is safer than using prescription drugs for the same purpose, due to the fact that it has no negative side effects   "The (surgery) patients who listened to music had less anxiety (before going into surgery) and lower cortisol than people who took drugs." ... But this might be due to the statistical data rather than actual qualitat...

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