Instrumentation
The size and composition of a marching band can vary greatly. Some bands have fewer than twenty members, and some have over 500. American marching bands vary considerably in their instrumentation. Some bands omit some or all woodwinds, but it is not uncommon to see piccolos, flutes, soprano clarinets, alto saxophones, and tenor saxophones. E♭ clarinets, alto clarinets, bass clarinets, and baritone saxophones are less common, but can be found in some bands. Bassoons and oboes are very seldom found on a field due to the risk of incidental damage, the impracticality of marching with an exposed double reed, and high sensitivity to weather.
The brass section usually includes trumpets or cornets, French horns, alto horns, or mellophones, tenor trombones, baritone horns or euphoniums, and tubas or sousaphones. E♭soprano cornets are sometimes used to supplement or replace the high woodwinds. Some especially large bands use flugelhorns and bass trombones. Specially designed versions of the lower brass have been created for use while marching. These are typically wrapped in such a way that allow the bell to face toward the audience at all times. Bands may also modify their instrumentation to remove slide trombones completely and replace them with another instrument, such as a valved trombone or marching baritone.
Marching percussion (often referred to as the drumline, battery, or back battery) typically includes snare drums, tenor drums, bass drums, and cymbals and are responsible for keeping tempo for the band. All of these instruments have been adapted for mobile, outdoor use. Marching versions of the glockenspiel (bells), xylophone, and marimba are also rarely used by some ensembles. Historically, the percussion section also employed mounted timpani that featured manual controls.
For bands that include a front ensemble (also known as the pit or auxiliary percussion), stationary instrumentation may include orchestral percussion such as timpani, tambourines, maracas, cowbells, congas, wood blocks, marimbas, xylophones, bongos, vibraphones, tambourines, timbales, claves, guiros, and chimes or tubular bells, concert bass drums, and gongs, as well as a multitude of auxiliary percussion equipment. Drum sets, purpose-built drum racks, and other mounted instruments are also placed here. Until the advent of the pit in the early 1980s, many of these instruments were actually carried on the field by marching percussionists by hand or on mounting brackets. Some bands also include electronic instruments such as synthesizers, electric guitars, and bass guitar, along with the requisite amplification. If double-reed or string instruments are used, they are usually placed here, but even this usage is very rare due to their relative fragility. Unusual percussive instruments are sometimes used, including brake drums, empty propane tanks, trashcans, railroad ties, stomping rigs, and other interesting sounds.
A rare inclusion in a marching band that is becoming more popular is the use of Electrophones in a marching band. The most common electric instrument seen is a bass guitar, but some schools also use keyboards and lead guitar. To make the electric instruments usable, external power in the stadium is normally used, but some groups may use a car-battery mechanism that requires a car battery and a converter to give the instruments and amplifiers remote power. Most bands will have the guitars in the pit with keyboard and auxiliary percussion, but some guitarists do march in the field show. This is made possible by the use of wireless transmission systems that allow the guitarists to hook a wireless transmitter to their instrument, while a receiver is hooked to the amp. This allows free motion of the guitarists to a fixed range of distance between the transmitter and receiver. This implementation of equipment can also be used in parades. Some band scores have parts for bass guitar, but in the event that a score does not, the bass guitarist will normally play bassoon, baritone-bass clef, euphonium-bass clef, or trombone music. It is very rare for a score to have a part for electric guitar, but the guitarist may use oboe or flute music in this situation.
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