Personalized Musical Triangle Youth T-Shirt. The musical triangle disappear in it's complexity text with the image of a triangle is a humorous play on the Bermuda triangle and a funny gift design for percussionists, music teachers and students in orchestra and concert band. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.