Personalized Choir Or Marching Band Treble Music Gift Youth Long Sleeve T-Shirt. Treble clef music Youth Long Sleeve T-Shirt - White with yes I'm treble humor quote for marching band, choir soprano singer, orchestra or a piano student. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)