Personalized Intelligent Tuba Toddler Long Sleeve T-Shirt. Tuba the instrument for intelligent people is a humorous low brass design. Fun gifts for musicians, students and teachers at back to school, birthdays, holidays and graduations. 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.