Personalized Flute Player Gift (treble) Toddler Long Sleeve T-Shirt. This funny where flutes go treble follows Toddler Long Sleeve Tee - Black makes a great Toddler Long Sleeve Tee - Black for a flute section or flute teacher. 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.