About the DEG HC250 Clamp-On Trombone Lyre:
 
Playing a trombone standing still is hard enough. It’s a different story marching all over a football field doing a complex field show. The DEG Trombone lyre clamps on any trombone bell rim and holds your music confidently in place, even in the most demanding conditions. The clamp is made of a slip-resistant, non-scratching material that will not harm your instrument.