As musicians, we are all aware that music makes kids smarter! It can improve concentration levels, test scores, creativity, etc. However, some people are not aware of this! This article could be a good selling point to urge parents to get kids into private lessons or to fight to keep music programs in schools. PBS is also a reputable resource, especially to parents.
http://www.pbs.org/parents/education/music-arts/the-benefits-of-music-education/