A big band is a type of musical ensemble that usually consists of ten or more musicians with four sections: saxophones, trumpets, trombones, and a rhythm section. Big bands originated during the early 1910s and dominated jazz in the early 1940s when swing was most popular. The term "big band" is also used to describe a genre of music. One problem with this usage is that it overlooks the variety of music played by these bands.

Although big bands are identified with the swing era, they continued to exist after those decades, though the music they played was often different from swing. Bandleader Charlie Barnet's recording of "Cherokee" in 1942 and "The Moose" in 1943 have been called the beginning of the bop era. Woody Herman's first band, nicknamed the First Herd, borrowed from progressive jazz, while the Second Herd emphasized the saxophone section of three tenors and one baritone. In the 1950s, Stan Kenton referred to his band's music as "progressive jazz", "modern", and "new music". He created his band as a vehicle for his compositions. Kenton pushed the boundaries of big bands by combining clashing elements and by hiring arrangers whose ideas about music conflicted. This expansive eclecticism characterized much of jazz after World War II. During the 1960s and '70s, Sun Ra and his Arketstra took big bands further out. Ra's eclectic music was played by a roster of musicians from ten to thirty and was presented as theater, with costumes, dancers, and special effects. As jazz was expanded during the 1950s through the 1970s, the Basie and Ellington bands were still around, as were bands led by Buddy Rich, Gene Krupa, Lionel Hampton, Earl Hines, Les Brown, Clark Terry, and Doc Severinsen. Progressive bands were led by Dizzy Gillespie, Gil Evans, Carla Bley, Toshiko Akiyoshi and Lew Tabackin, Don Ellis, and Anthony Braxton. Other bandleaders used Brazilian and Afro-Cuban music with big band instrumentation, and big bands led by arranger Gil Evans, saxophonist John Coltrane (on the album Ascension from 1965) and bass guitarist Jaco Pastorius introduced cool jazz, free jazz and jazz fusion, respectively, to the big band domain. Modern big bands can be found playing all styles of jazz music. Some large contemporary European jazz ensembles play mostly avant-garde jazz using the instrumentation of the big bands. Examples include the Vienna Art Orchestra, founded in 1977, and the Italian Instabile Orchestra, active in the 1990s. In the late 1990s, there was a swing revival in the U.S. The Lindy Hop became popular again and young people took an interest in big band styles again. Big bands maintained a presence on American television, particularly through the late-night talk show, which has historically used big bands as house accompaniment. Typically the most prominent shows with the earliest time slots and largest audiences have bigger bands with horn sections while those in later time slots go with smaller, leaner ensembles.

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Although big bands are identified with the swing era, they continued to exist after those decades,