The term backline is used in popular music and sound reinforcement system contexts to refer to electronic audio amplification equipment and speaker enclosures that are placed behind the band or the rhythm section on stage, including amplifiers and speaker cabinets for guitars, bass guitars and keyboards. Such equipment is often rented or leased by the band or their management, or provided by the venue. Speakers placed at the front of the stage facing the performers are also known as monitor speakers or "foldback". The main speakers facing the audience are sometimes referred to as "front of house speakers".