The FEI also does not allow the Dr. Bristol. Both Dressage and Eventing disciplines allow the Dr Bristol in our U.S. national competitions My suggestion is that for USEF National Eventing Competitions we accept the same bits that USEF National Dressage competitions do in the interest of keeping it simple.
Percussion Instruments. Bass Drum - The bass drum is a percussion instrument and is the lowest and largest member of the drum family. Bass drums are used in orchestral music as well as marching bands. Cymbals - Percussions are music instruments that are either struck, shaken or scraped and may or may not have pitch. Cymbals are a perfect example of a non-pitched percussion instrument. The type that is used in marching bands is called crash cymbals.
Members of the Brigadiers Drum & Bugle Corps (NY) hornline in 2007, with contrabass horns (contras). The contrabass bugle (usually shortened to contra or simply called the marching tuba) is the lowest-pitched instrument in the drum and bugle corps and marching band hornline. It is essentially the drum corps' counterpart to the marching band's sousaphone: the lowest-pitched member of the hornline, and a replacement for the concert tuba on the marching field. It is different from the other members of the marching band and drum corps hornlines in that it rests on the shoulder of the player, rather than being held in front of the body.