Klaus Otto Wilhelm Voormann (born 29 April 1938) is a German artist, musician, and record producer.

Following the band's split, rumors circulated of the formation of a group named the Ladders, consisting of Lennon, Harrison, Starr and Voormann.

One day, after an argument with her and Jürgen Vollmer, Voormann wandered down the Reeperbahn, in the St. Pauli district of Hamburg, and heard music coming from the Kaiserkeller club.

As a trio, Voormann, Kirchherr and Vollmer stood out in the Kaiserkeller, dressed in suede coats, wool sweaters, jeans and round-toed shoes, when most of the customers had greased-back Teddy boy hairstyles and wore black leather jackets and pointed boots.

[5] Voormann was in a relationship with Kirchherr at the time, and lived just around the corner from her parents' upper-class home in the Altona district of Hamburg.

Voormann lived with Harrison and Ringo Starr for a time, before finding work as a commercial artist and renting an apartment of his own.

The following year, artwork by Voormann graced the front cover of the American edition of the Bee Gees' album Idea.

Voormann mentions his negotiations with the group in his autobiography, Warum spielst Du Imagine nicht auf dem weißen Klavier, John?

[11] After that, Voormann became a session musician, playing on solo projects by Lou Reed, Carly Simon, James Taylor and Harry Nilsson, among others.

[14] After the Beatles disbanded, there were rumours of them reforming as the Ladders, with Voormann on bass as a replacement for Paul McCartney, but the plan never materialised.

[1] Voormann served as the three former Beatles' bassist of choice through the mid-1970s, playing on Lennon's albums John Lennon/Plastic Ono Band (1970), Imagine (1971), Some Time in New York City (1972), Walls and Bridges (1974) and Rock 'n' Roll (1975); Harrison's All Things Must Pass (1970), Living in the Material World (1973), Dark Horse (1974) and Extra Texture (Read All About It) (1975); and Starr's Ringo (1973), Goodnight Vienna (1974) and Ringo's Rotogravure (1976).

On 29 November 2002 Voormann played bass on the song "All Things Must Pass" at the Concert for George, held at London's Royal Albert Hall.

In October that same year, he published his autobiography, Warum spielst du Imagine nicht auf dem weißen Klavier, John?

Erinnerungen an die Beatles und viele andere Freunde (Why Don't You Play "Imagine" on the White Piano, John?

It was credited to 'Voormann & Friends' and featured McCartney, Starr, Yusuf Islam (formerly known as Cat Stevens), Don Preston, Dr. John, The Manfreds, Jim Keltner, Van Dyke Parks, Joe Walsh and many others.

The album has been available in a limited number of audio CDs, vinyl LPs, and deluxe box sets with original (and signed) graphics by Voormann; and included new versions of old songs such as "My Sweet Lord", "All Things Must Pass", "Blue Suede Shoes", "You're Sixteen" and Bob Dylan's "Quinn the Eskimo (The Mighty Quinn)".

[22] In 2017, he designed the artwork featured in the deluxe box set edition of As You Were, the debut solo album from Liam Gallagher.

He also made a surreal pencil drawing of Mad magazine mascot Alfred E. Neuman for the publication's December 2017 issue.

Voormann designed the cover art and booklet sketch of the album ¡Spangled!, by Gaby Moreno and Van Dyke Parks, released in 2019.

King With Nicolette Larson With John Lennon With Jackie Lomax With Geoff Muldaur With Maria Muldaur With Randy Newman With Harry Nilsson With Yoko Ono With Van Dyke Parks With Billy Preston With Lou Reed With Martha Reeves With Stephan Remmler With Leon Russell With Carly Simon With Splinter With Ringo Starr With Loudon Wainwright III With Howlin' Wolf