High Quality Content by WIKIPEDIA articles! Marching percussion instruments are specially designed to be played while moving. This is achieved by attaching the drum(s) to a special harness (also called a carrier or rack) worn by the drummer. The drums are designed and tuned for maximum articulation and projection of sound, as marching activities are almost always outdoors or in large interior spaces. Articulation is paramount to producing a "clean" sound from all the drummers in the line. These instruments are used by marching bands, drum and bugle corps, indoor percussion ensembles, and pipe bands. A marching percussion ensemble is frequently known as a drum line or battery.