The practical consequence of making music mandatory is that every kid gets a cheap, proven boost in the skills that actually matter later: focus, memory, pattern recognition, teamwork, and the patience to practice something hard for months. Right now that boost goes mostly to kids whose parents can pay for it, and that's the real unfairness. And the cost isn't huge; a weekly class, shared instruments, one teacher across grades. If a school already funds sports and art, it can fund this.