The Monks, referred to by the name monks on record sleeves, were an American rock band formed in Gelnhausen, West Germany, in 1964. Assembled by five American GIs stationed in the country, the group grew tired of the traditional format of rock, which motivated them to forge a highly experimental style characterized by an emphasis on rhythm over melody, augmented by the heavy use of distortion. The band's unconventional blend of shrill vocals, confrontational lyrics, feedback, and guitarist David Day's six-string banjo baffled audiences, but music historians have since identified the Monks as one of the most innovative rock bands of their time. The band's lyrics often voiced objection to the Vietnam War and social alienation, prefiguring the harsh and blunt social and political commentary of the punk rock movement. The band's appearance was considered as shocking as their music, as they attempted to mimic the look of Catholic monks by wearing black habits with cinctures symbolically tied around their necks, and hair worn in partially shaved tonsures.

Audio feedback is a positive feedback situation that may occur when an acoustic path exists between an audio input and an audio output. In this example, a signal received by the microphone is amplified and passed out of the loudspeaker. The sound from the loudspeaker can then be received by the microphone again, amplified further, and then passed out through the loudspeaker again. The frequency of the resulting howl is determined by resonance frequencies in the microphone, amplifier, and loudspeaker, the acoustics of the room, the directional pick-up and emission patterns of the microphone and loudspeaker, and the distance between them. The principles of audio feedback were first discovered by Danish scientist Søren Absalon Larsen, hence it is also known as the Larsen effect.