Personalized Keyboardist Extraordinaire Youth Long Sleeve T-Shirt. Personalized Keyboard Extraordinaire Youth Long Sleeve T-Shirt - White has cool keyboardist slogan and graphic c. Ne' Metzger. Great gift for jazz band keyboard accompanists or any keyboard instrument player. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)