A modern drum and bugle corps, is a musical marching ensemble consisting of brass instruments, percussion instruments, synthesizers, and color guard. Typically operating as independent non-profit organizations, drum corps perform in competitions, parades, festivals, and other civic functions. Participants of all ages are represented within the band activity, but the majority are between the ages of 13 and 22 and are members of corps within Drum Corps International or Drum Corps Associates.
Competitive drum corps participate in summer touring circuits, such as Drum Corps International (DCI) and Drum Corps Associates (DCA). Corps prepare a new show each year, approximately 8–12 minutes in length, and refine it throughout the summer tour. Shows are performed on football fields and are judged in various musical and visual categories, or "captions". Musical repertoires vary widely among corps and include symphonic, jazz, big band, contemporary, rock, wind band, vocal, Rap, Broadway, and Latin music, among other genres. Competitive junior corps usually spend between 10 and 15 weeks on tour over the summer, practicing and performing full-time. All-age and alumni corps have less demanding schedules, practicing and performing mostly on weekends.
Drum and bugle corps stems from a rich American and Canadian military history, separate from other marching musical activities. Beginning after World War I through the 1970s, corps and competitions were often sponsored by the VFW, Scout troops, churches, the Royal Canadian Legion, and the American Legion. Owing to many of these groups' roots, corps were traditionally militaristic. By the late 1960s, many corps wanted more creative freedom and better financial compensation than was offered by their sponsoring organizations. Some felt the prize-money structures, based on competitive placement, were not fairly compensating all corps for their appearances. Additionally, some felt the current judging rules were stifling musical and theatrical possibilities. At the peak of North American drum corps participation (with perhaps a thousand active corps in the U.S. and nearly as many in Canada), several corps decided to "unionize", as stated by Don Warren (founder of the Cavaliers). They formed their own organizations, which ultimately led to the formation of DCA in 1965 and DCI in 1972. By this time, many corps had already lost their church or community sponsors.