Music makes us better at math. Music makes us better readers. Music makes us more creative and better able to concentrate in school. Or so countless studies have claimed.Music Makes Us is a new initiative in the Nashville public school system that would tap into the vast resources of Music Row and expand music education at a time when other districts are cutting back or cutting out music classes entirely.Starting next year, Metro Nashville Public Schools will expand music offerings. They’ll still have marching band and glee club, but thanks to an avalanche of promised donations and music industry volunteers, students also will have the option of joining a rock ’n’ roll band, or performing bluegrass or hip-hop, or signing up for a songwriting class or a course in DJ remixing.