A septet is a formation containing exactly seven members. It is commonly associated with musical groups, but can be applied to any situation where seven similar or related objects are considered a single unit, such as a seven-line stanza of poetry. In jazz music a septet is any group of seven players, usually containing a drum set, string bass or electric bass, and groups of one or two of the following instruments, guitar, piano, trumpet, saxophone, clarinet, or trombone.