In January 1971, Lawyer David Hirst, filed papers demanding legal dissolution of the Beatles on behalf of Paul McCartney. The suit is filed against John Lennon, Richard Starkey (Ringo Starr), George Harrison and manager Allen Klein on three grounds: 1) The group no longer performs together; 2) Much against Paul's wishes, Allen Klein was appointed as business manager by the other three Beatles; 3) Paul never saw audited accounts of the bands revenue after Klein was brought on board to manage the group.
In 1975, Judge rules in McCartney's favor and the Beatles are "officially dissolved."
Shortly before and after the official dissolution of the group, all four Beatles released solo albums, including Lennon's John Lennon/Plastic Ono Band, McCartney's "McCartney", Starr's "Sentimental Journey", and Harrison's "All Things Must Pass'. Some of their albums featured contributions by other former Beatles; Starr's 'Ringo" (1973) was the only one to include compositions and performances by all four, albeit on separate songs. Harrison showed his socio-political consciousness and earned respect for his contribution for arranging the Concert For Bangladesh in New York City in August 1971 along with sitar maestro Ravi Shankar.
Other than an unreleased jam session in 1974 (later bootlegged as A Toot and a Snore in '74), Lennon and McCartney never recorded together again.