The Complete Beatles Recording Sessions (subtitled The Official Story of the Abbey Road Years 1962–1970) is a reference book on the English rock band the Beatles compiled by author Mark Lewisohn. Hamlyn published it in the UK in 1988 and Harmony Books published it in the US. The book is written in the form of a diary, documenting each day from 1962 through 1970 that the Beatles spent in a recording session or producers and engineers spent mixing and editing their music. The book has been widely described as an "essential" reference book for study of the band. Background In the early 1980s, EMI balance engineer John Barrett found himself unoccupied while undergoing chemotherapy. Ken Townsend, the General Manager of Abbey Road Studios, later recalled suggesting Barrett keep his mind engaged by listening to the Beatles' session tapes and write down information pertaining to them. Author Stephen Matteo alternatively suggests Barrett's work was intended to gather interesting unreleased material for The Beatles at Abbey Road, a 1983 multimedia presentation at Abbey Road Studios. Barrett produced a colour-coded catalogue, which Townsend later said displayed an "incredible" attention to detail. In 1982, while attending Liverpool's annual Beatles convention, Townsend, Barrett and author Brian Southall used Barrett's work during a Q&A session. Attendees were enthusiastic about the new information and suggested the catalogue be published, but Barrett's death in 1984 precluded it. The project was nearly abandoned until Abbey Road employee Kathryn Varley pushed for its completion. Mark Lewisohn began formally researching the Beatles in the late 1970s, working as a research assistant for Philip Norman's book Shout! (1981). In 1986, Lewisohn published his first reference book, The Beatles Live!, a chronological guide of the group's live performances. The book took years to research and compiles over 1,000 primary sources to provide an exhaustive guide. Because of his work compiling The Beatles Live!, EMI commissioned Lewisohn in 1987 to continue Barrett's work and write a book detailing the Beatles' recording sessions. Besides Abbey Road Studios staffers and the Beatles, Lewisohn was the first person granted access to listen to all of the Beatles' working tapes, a privilege not extended again until 1995 for writer Mark Hertsgaard. Working from 1987 through 1988, the book took two years to research and write. Lewisohn consulted the studio's recording paperwork, reproducing some of it in the book, and interviewed eighty people who were present at the sessions,