There is no mandatory requirement, but it cannot be actually operated. Magic score can only be made after music knowledge and composition 9, and magic score can only pop up after playing 9. Magic music can work without music knowledge and composition, but pop-up music is a complete failure. B+ (maybe A+) can play music made with 9- knowledge of music, and the magic effect and the probability of successful composition are calculated separately. It doesn't matter. But if you want to practice high, you will generally practice high music knowledge, otherwise it will be very troublesome.