Personalized Music Rocks Dark Products Youth Long Sleeve 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. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)