Personalized Flute Musician Im Treble Toddler Long Sleeve T-Shirt. Flute player marching band Toddler Long Sleeve Tee - Pink apparel has hilarious yes I'm treble message for the flutist with a bit of attitude. 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.