Big bands are large musical ensembles that typically consist of brass, woodwind, and rhythm sections. They became popular in the 1930s and 1940s, playing a style of music known as swing. Big bands often feature a conductor or bandleader who guides the musicians and arranges the music, creating lively and energetic performances that are perfect for dancing. Some of the most famous big bands were led by musicians like Duke Ellington, Count Basie, and Benny Goodman. These bands played in dance halls and on the radio, helping to shape the sound of jazz and popular music during their heyday. Today, big bands continue to perform, keeping the spirit of this vibrant musical tradition alive.