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It is common knowledge that music can have a powerful effect on our (36) . In fact, since 1930s, music therapists have (37) on music to soothe (38) and help control pain. Now psychologists are (39) that music can also help (40) depression and improve concentration. For instance, in a recent study, 15 surgeons were given some highly (41) math problems to solve. They were (42) into three groups: one worked in silence, and in another, the surgeons listened to music of their choice on headphones; the third listened to (43) music chosen by the researchers. The results of the study may surprise you. (44) . One possible explanation is that listening to music you like stimulates the Alfa-wave in the brain, increases the heart rate and expands the breathing. That helps to reduce stress and sharpen concentration. Other research suggests a second relation between the music and the brain: (45) , the researchers found that some students showed a large increase in endorphin, a natural pain reliever. (46) .