A musical composition for eight instruments or eight singers.
An octet is usually written of two groups of quartets. The most common settings are:
- String Octet: Consisting of two string quartets, meaning for four violins, two violas, and two cellos.
- Woodwind Octet: Consisting of two woodwind quartets, meaning for two oboes, two clarinets, two french horns, and two bassoons.
- String and Woodwind Octet: Consisting of a string quartet and a woodwind quartet, meaning for two violins, viola, cello, clarinet, oboe, french horn, and bassoon.