Modern drum corps not only have marching drummers, but also have 'front ensembles," who play instruments that cannot be marched with. These include timpani sets, or kettle drums, vibraphones, marimbas, tubular bells, xylophones, and various "auxiliary" percussion that would be inconvenient to march with. Front ensembles can also have suspended cymbals, especially if the corps has no marching cymbals.