After brief music training 8-10 year old kids show less hyperactivity and better inhibitory control.

Fasano et al. show that only three months of orchestral music training improves inhibitory control and reduces hyperactivity in 8-10 year old children. From the Science Magazine summary of Tamela Hines:

Play your notes and nothing extra. Wait during your measures of rest. Watch the conductor and synchronize with your neighbors. Such attention and sensorimotor skills are key to performing music as part of a group, whether orchestral or choral or a marching band. Not everyone, however, has the time and interest to become a professional musician. Fasano et al. tested the effect of a short orchestral training program, spanning 10 sessions over 3 months, on a group of psychologically normal schoolchildren in Italy. Children in this brief program improved on measures of inhibitory control and hyperactivity. The results suggest new, and fun, ways to help children manage their own hyperactive behaviors.