At first, some scientists thought that the brain could benefit just by listening to music. They showed that people's scores on IQ tests improved when they listened to classical music by Mozart. This led people to believe that listening to music makes you smarter. But this was an oversimplification and an overstatement of the results. Subsequent studies showed that listening to music does not actually make you smarter, but rather raises your level of enjoyment and decreases your feelings of stress, which sometimes result in better focus and improved test scores. This means that, while music in your home or classroom would not automatically improve your performance, it could be useful to help you to focus on a new task or in situations when increased attention and decreased stress are necessary. Further, just listening to music may have a different, or perhaps smaller, effect than actually playing music. This is much the same as the way that playing sports will improve your physical condition more than simply watching sports. Therefore, the focusing power of music could be amplified by playing along.

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Go to source: https://kids.frontiersin.org/article/10.3389/frym.2020.00081