<span>The Mainstream jazz form that relied heavily on arrangement is </span>a Big Band. It dominated jazz in the early 1940s. A big band<span> is a type of </span>musical group that usually consists of ten or more musicians with four sections, namely, trumpets, saxophones<span>,</span><span> </span>trombones<span>, and a </span>rhythm section. Big Band is also used to describe a genre of music.
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