A big band is a large group of musicians who play jazz or dance music. Big bands were especially popular from the 1930s to the 1950s.
big band in British English
noun
a large jazz or dance band, popular esp in the 1930s to the 1950s
big band in American English
an ensemble of ten or more players, usually 16 to 20, including sections of rhythm, brass, and reeds, playing arrangements of jazz, popular dance music, etc.
big-band in American English
(ˈbɪgˌbænd)
adjective
1.
of or characteristic of jazz as played by large bands and, specif., of dance music as played by largeswing bands of the 1930s and 1940s