BGD-BGD-BOP BGD-BGD-BOP (biggidy-biggidy-bop) is a 2 mallet exercise based on the chromatic scale. It also helps train players to find target notes in runs. From the Marching Band Front Ensemble Warm Ups packet. Add to cart: $1.00 In cart Not available Out of stock $1.00 Share BGD-BGD-BOP Share link