Personalized Rockin' Guitar Toddler Long Sleeve T-Shirt. Rockin' text with a happy rock playing a guitar is a funny music design for musicians, students and teachers at birthdays and holidays. 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.