Big band refers to a jazz group of 10 or more musicians, usually featuring at least three trumpets, two or more trombones, four or more saxophones, and a rhythm section of accompanists playing some combination of piano, guitar, bass, and drums. Big-band music as a concept for music fans is identified most with the swing era, though there were large, jazz-oriented dance bands before the swing era of the 1930s and 1940s and large jazz-oriented bands after the swing era.