Personalized Music Rocks Dark Products 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. Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.