Personalized Trombone Rocks Toddler Long Sleeve T-Shirt. Trombone Rocks with three dancing rocks holding trombones is a humorous low brass design. Fun gifts for musicians at back to school, marching band, birthdays, holidays and graduation. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.