Multitrack recording in the context of "Recording practices of the Beatles"

Optical sound is a means of storing sound recordings on transparent film. Originally developed for military purposes, the technology first saw widespread use in the 1920s as a sound-on-film format for motion pictures. Optical sound eventually superseded all other sound film technologies until the advent of digital sound became the standard in cinema projection booths. Optical sound has also been used for multitrack recording and for creating effects in some musical synthesizers.

In music production, the recording studio is often treated as a musical instrument when it plays a significant role in the composition of music. Sometimes called "playing the studio", the approach is typically embodied by artists or producers who favor the creative use of studio technology in record production, as opposed to simply documenting live performances in studio. Techniques include the incorporation of non-musical sounds, overdubbing, tape edits, sound synthesis, audio signal processing, and combining segmented performances (takes) into a unified whole.

Composers have exploited the potential of multitrack recording from the time the technology was first introduced. Before the late 1940s, musical recordings were typically created with the idea of presenting a faithful rendition of a real-life performance. Following the advent of three-track tape recorders in the mid-1950s, recording spaces became more accustomed for in-studio composition. By the late 1960s, in-studio composition had become standard practice, and has remained as such into the 21st century.

Lester William Polsfuss (June 9, 1915 – August 12, 2009), known as Les Paul, was an American jazz, country, and blues guitarist, songwriter, luthier, and inventor. He was one of the pioneers of the solid-body electric guitar, and his prototype, called the Log, served as inspiration for the Gibson Les Paul. Paul taught himself how to play guitar, and while he is mainly known for jazz and popular music, he had an early career in country music. In the 1950s, he and his wife, singer and guitarist Mary Ford, made numerous recordings, selling millions of copies.

Paul is credited with many recording innovations. His early experiments with overdubbing (also known as sound on sound), delay effects such as tape delay, phasing, and multitrack recording were among the first to attract widespread attention. His licks, trills, chording sequences, fretting techniques, and timing set him apart from his contemporaries and inspired many guitarists of the present day.

In sound recording and reproduction, audio mixing is the process of optimizing and combining multitrack recordings into a final mono, stereo or surround sound product. In the process of combining the separate tracks, their relative levels are adjusted and balanced and various processes such as equalization and compression are commonly applied to individual tracks, groups of tracks, and the overall mix. In stereo and surround sound mixing, the placement of the tracks within the stereo (or surround) field are adjusted and balanced. Audio mixing techniques and approaches vary widely and have a significant influence on the final product.

Audio mixing techniques largely depend on music genres and the quality of sound recordings involved. The process is generally carried out by a mixing engineer, though sometimes the record producer or recording artist may assist. After mixing, a mastering engineer prepares the final product for production.

Edward Ray Cochran (/ˈkɒkrən/ KOK-rən; October 3, 1938 – April 17, 1960) was an American rock and roll musician. His songs, such as "Twenty Flight Rock", "Summertime Blues", "C'mon Everybody" and "Somethin' Else", captured teenage frustration and desire in the mid-1950s and early 1960s. Cochran experimented with multitrack recording, distortion techniques, and overdubbing, even on his earliest singles. Cochran played the guitar, piano, bass, and drums. His image as a sharply dressed and attractive young man with a rebellious attitude epitomized the stance of the 1950s rocker, and in death, Cochran achieved iconic status.

Cochran was involved with music from an early age, playing in the school band and teaching himself to play blues guitar. In 1955, Cochran formed a duo with the guitarist Hank Cochran (no relation) and became known as the Cochran Brothers. When they split the following year, Eddie began a song-writing career with Jerry Capehart. His first success came when he performed the song "Twenty Flight Rock" in the film The Girl Can't Help It, starring Jayne Mansfield. Soon afterward, he signed a recording contract with Liberty Records and his first record for the label, "Sittin' in the Balcony", rose to number 18 on the Billboard charts.