Jazz bands are musical groups that specialize in playing jazz music. Combos, which is a six-letter term, is a type of jazz band that typically consists of a small group of musicians, usually three to five members. Combos often play in nightclubs and other venues, and they are known for their improvisational style. They often use a variety of instruments, including drums, bass, guitar, piano, and horns. Combos are an important part of the jazz music scene, and they have been around since the early 20th century.