Personalized French Horn Funny Music Joke Youth Long Sleeve T-Shirt. This french horn player band gift has hilarious music slogan that says french horn the only instrument that matters on a Youth Long Sleeve T-Shirt - White for a musician. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)