A one-man band is a musician who plays a number of musical instruments simultaneously using their hands, feet, limbs, and various mechanical contraptions. The simplest type of "one-man band" — a singer accompanying themselves on acoustic guitar and harmonica mounted in a metal "harp rack" below the mouth — is often used by buskers. More complicated setups may include wind instruments strapped around the neck, a large bass drum mounted on the musician's back with a beater which is connected to a foot pedal, cymbals strapped between the knees or triggered by a pedal mechanism, tambourines and maracas tied to the limbs, and a stringed instrument strapped over the shoulders (e.g., a banjo, ukulele or guitar). Since the development of Musical Instrument Digital Interface (MIDI) in the 1980s, musicians have also incorporated chest-mounted MIDI drum pads, foot-mounted electronic drum triggers, and electronic pedal keyboards into their set-ups.