Short answers, pulled from the story.
Klaus Voormann is a German artist, musician, and record producer born on the 29th of April 1938 in Berlin. He is best known for designing the Grammy Award-winning cover of the Beatles' 1966 album Revolver and for serving as the preferred session bassist for John Lennon, George Harrison, and Ringo Starr across the early-to-mid 1970s.
Voormann first encountered the Beatles at the Kaiserkeller club in Hamburg's St. Pauli district in the early 1960s. He had wandered in after an argument and heard their performance, having never heard rock 'n' roll before. He introduced himself to John Lennon that night, pressing a crumpled record sleeve he had designed into Lennon's hands.
Voormann won the Grammy Award for Best Album Cover, Graphic Arts for designing the cover of the Beatles' 1966 album Revolver. He used a scrapbook collage style for the design, and in 2016 he revisited the project in a graphic novel titled Revolver 50: Birth of an Icon.
Voormann played bass on five John Lennon solo albums: John Lennon/Plastic Ono Band in 1970, Imagine in 1971, Some Time in New York City in 1972, Walls and Bridges in 1974, and Rock 'n' Roll in 1975. He had also played with Lennon as a member of the Plastic Ono Band on Live Peace in Toronto 1969, recorded in Toronto on the 13th of September that year.
Voormann was a member of Manfred Mann from 1966 to 1969, playing bass and flutes. He appeared on all their UK hits from "Just Like a Woman" in July 1966 through to "Ragamuffin Man" in April 1969, including the 1968 international hit "The Mighty Quinn".
Voormann released his debut solo album A Sideman's Journey on the 7th of July 2009, credited to Voormann and Friends. The album featured Paul McCartney, Ringo Starr, Yusuf Islam (formerly Cat Stevens), Dr. John, Van Dyke Parks, Joe Walsh, and Jim Keltner, among others, and was available in audio CDs, vinyl LPs, and deluxe box sets with original signed graphics by Voormann.