The Mellotron is an electro-mechanical, polyphonic tape replay keyboard originally developed and built in Birmingham, England in the early 1960s. It superseded the Chamberlin, which was the world's first sample-playback keyboard intended for music. The concept of the Chamberlin was itself modeled after the Laff Box invented by engineer Charlie Douglass in order to insert prerecorded laughs into TV and radio programs more easily in the then-developing field of post-production.

The heart of the instrument is a bank of parallel linear magnetic audio tape strips. Playback heads underneath each key enable the playing of pre-recorded sounds. Each of the tape strips has a playing time of approximately eight seconds, after which the tape comes to a dead stop and rewinds to the start position. A major advantage of using tape strips, as opposed to tape loops or cassettes (cf. the Birotron) is that the Mellotron can reproduce the "attack" transient of the instruments recorded on the tape. A drawback is the short "decay" time of the note.

Sir James Paul McCartney, MBE, Hon RAM, FRCM (born 18 June 1942) is an English musician, singer-songwriter and composer. Formerly of the Beatles (1960–1970) and Wings (1971–1981), he has been described by Guinness World Records as "The Most Successful Composer and Recording Artist of All Time", with 60 gold discs and sales of over 100 million albums and 100 million singles. With John Lennon, George Harrison, and Ringo Starr, he gained worldwide fame as a member of the Beatles, and with Lennon formed one of the most celebrated songwriting partnerships of the 20th century. After leaving the Beatles, he began a solo career and later formed the band Wings with his first wife, Linda Eastman, and singer-songwriter Denny Laine.

According to the BBC, his Beatles song "Yesterday" has been covered by over 2,200 artists—more than any other song. Wings' 1977 release, "Mull of Kintyre", became one of the best-selling singles ever in the UK, and he is "the most successful songwriter" in UK chart history, according to Guinness. As a songwriter or co-writer, he is included on thirty-one number one titles on the Billboard Hot 100, and as of 2012 he has sold over 15.5 million RIAA certified units in the United States.

Richard Christopher Wakeman (born 18 May 1949) is an English keyboard player, composer and songwriter best known for being the former keyboardist in the progressive rock band Yes. He is also known for his solo albums, contributing to the BBC comedy series Grumpy Old Men and for Rick's Place, his former radio show on Planet Rock that aired until December 2010.

Wakeman was born in West London. He purchased his first electronic keyboard at 12 years of age. In 1968, he studied the piano, clarinet, orchestration and modern music at the Royal College of Music before leaving after a year in favour of session music work. He went on to feature on songs by artists including Black Sabbath,David Bowie, T. Rex, Elton John and Cat Stevens. Wakeman joined the folk group Strawbs in 1969 and played on three of their albums. He first joined Yes in 1971 to replace Tony Kaye, and left the group in 1974 to work on his solo career. He returned in 1976 before leaving with lead vocalist Jon Anderson in 1980. Wakeman was part of the side project Anderson Bruford Wakeman Howe, a group of ex-Yes members formed in 1989, and the eight-member Yes line-up that followed until his third departure in 1992. He returned for two years in 1995 and once more in 2002, where he was part of the band's 35th anniversary tour until its end in 2004.

Michael Thomas "Mike" Pinder (born 27 December 1941) is an English rock musician, and is a founding member and original keyboard player of the British rock group, the Moody Blues. He left the group following the recording of the band's album, Octave, in 1978. He is especially noted for his technological contribution to music.

Pinder was born to Bert and Gladys Pinder in Erdington, Birmingham, and as a young adult played in El Riot and the Rebels, a rock band that achieved some regional success. Bandmates in El Riot included future Moody Blues members Ray Thomas and John Lodge. After a spell in the British Army, later, Pinder and Thomas played together in a band called the Krew Cats; the band wound up in Germany playing at some of the cellars where The Beatles had polished their musicianship; however the Krew Cats' fortunes were not so bright - Pinder and Thomas, completely broke, wound up walking across northern Europe to get back home to England.

Around this time, Pinder was employed by Streetly Electronics, a firm that manufactured the Mellotron.

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