Personalized Music Rock On Youth T-Shirt. Music rock On text with a happy dancing rock is a humorous music design. Fun gifts for back to school,marching band, birthdays, holidays and graduation. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.