First, it will make them stay more active and it will improve their social life.
Because when they collaborate performances like choirs and orchestra at school program. They can take part in a contest or paly in front of their freind. That will be special experience at an elarly age.
Second, they better remembered metally and physically.
they could be good player or even if not they have good hobby without much effort. you know we have less time as we get older. At lease either they know how beautiful playing music or they have litte talent at music.

First, they will become more active and their social lives will improve because kids can participate in a competition or perform in front of their friends when they work together in school activities like choirs and orchestras. That will be a unique opportunity at such a young age. Second, they will improve both physically and intellectually. They might be skilled athletes, or even if not, they might have a rewarding activity with little effort. You know, as we age, we have less time. At least they have some musical talent or are aware of how beautiful performing music is.