A marching band is a group of instrumental musicians who perform while marching, often for entertainment or competition. Instrumentation typically includes brass, woodwind, and percussion instruments. Most marching bands wear a uniform, often of a military style, that includes an associated organization's colors, name or symbol. Most high school marching bands, and some college marching bands, are accompanied by a color guard, a group of performers who add a visual interpretation to the music through the use of props, most often flags, rifles, and sabres. Marching bands are generally categorized by function, size, age, instrumentation, marching style, and type of show they perform. In addition to traditional parade performances, many marching bands also perform field shows at sporting events and marching band competitions. Increasingly, marching bands perform indoor concerts that implement many songs, traditions, and flair from outside performances. In some cases, at higher level competitions, bands will be placed into classes based on school size. History Percussion and wind instruments were used on the battlefield since ancient times. An Iron Age example would be the carnyx. The development of the military band from such predecessors was a gradual development of the medieval and early modern period. A prototype of the Ottoman military band may be mentioned in the 11th-century Dīwān Lughāt al-Turk. The European tradition of military bands formed in the Baroque period, partly influenced by the Ottoman tradition. 17th-century traveler Evliya Çelebi noted the existence of 40 guilds of musicians in Istanbul. In the 18th century, each regiment in the British Army maintained its own military band. Until 1749 bandsmen were civilians hired at the expense of the colonel commanding a regiment. Subsequently, they became regular enlisted men who accompanied the unit on active service to provide morale enhancing music on the battlefield or, from the late nineteenth century on, to act as stretcher bearers. Instruments during the 18th century included fifes, drums, the oboe (hautbois), French horn, clarinet and bassoon. Drummers summoned men from their farms and ranches to muster for duty. In the chaotic environment of the battlefield, musical instruments were the only means of commanding the men to advance, stand or retire. In the mid 19th century, each smaller unit had their own fifer and drummer, who sounded the daily routine. When units massed for battle a band of musicians was formed for the whole. In the United States, modern marching bands are most commonly