An audio recording technique, in which a performer sings or plays along with their own prerecorded part, for dramatic effect or to produce a stronger sound than with a single voice or instrument. Methods and media for sound recording are varied and have undergone significant changes between the first time sound was actually recorded for later playback until now. ...

Artificial or automatic doubletracking, also known as ADT, was developed at Abbey Road Studios by engineers recording the Beatles in the 1960s. It used a combination of synchronised tape recorders and electronic delay to mimic the effect created by doubletracking an instrument or voice. ADT produced a unique sound, which can be imitated to a point by analog or digital delay devices, but not precisely duplicated. (The latter technique is usually called doubling echo.) ĠħųłAutomatic double tracking (ADT) was an electronic system designed to augment the sound of voices and instruments during the recording process. ... Abbey Road Studios, created in November of 1931 by EMI in London, England, is best known as the legendary recording studio used by the rock bands, Cliff Richard and The Shadows, and The Beatles. ... The Beatles appeared on The Ed Sullivan Show in 1964 as part of their first tour of the United States, promoting their first hit single there, I Want To Hold Your Hand. ... In general, a tape recorder, tape deck, or tape machine is any device that records a fluctuating signal by moving a strip of magnetic tape across a tape head, which is a strong electromagnet. ... Delay is: In sound effects, any of a class of effect that adds one or more delayed versions of the original signal, to create effects such as echo or flanger. ...

John Lennon referred to his home-studio technique of overdubbing sounds with a pair of tape recorders to make song demos as "doubletracking", but this usage isn't technically correct; rather than laying the same part over, Lennon would normally add different parts to the originals. His post-Beatles albums frequently used doubling echo in place of the ADT system the Beatles had; some critics complained that the effect made the impression that Lennon recorded all his vocals in a bathroom. John Lennon Born 1940 in Liverpool, UK Died 1980 in New York City, US John Winston Lennon, later John Ono Lennon, (October 9, 1940 – December 8, 1980), was best known as a singer, songwriter, and guitarist for The Beatles. ... Overdub is a technique used by music studios to add a supplementary recorded sound to a previously taped musical recording, with the intention of either enhancing the quality of the original recording or of correcting human flaws such as the wrong execution of a certain section of the song. ... A demo version or demo of a song is one recorded for reference rather than for release. ...