Personalized Music Rocks Dark Products Youth T-Shirt. Music Rocks. These three musical rocks with a trombone, violin and guitar are shaking to the music. A humorous gift design for music lovers at birthdays, holidays and back to school. 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.