A big band is a type of
Big bands started as accompaniment for dancing. In contrast with the emphasis on improvisation, big bands relied on written compositions and arrangements. They gave a greater role to bandleaders, arrangers, and sections of instruments rather than soloists.
Big bands have four sections: trumpets, trombones, saxophones, and a rhythm section of guitar, piano, double bass, and drums.
 The division in early big bands was likely to be two or three trumpets, one or two trombones, three saxophones, and a rhythm section.
 In 1930, big bands usually consisted of three trumpets, three trombones, three saxophones, and a rhythm section of four instruments. Guitar replaced the