From Wikipedia:
For the still unfinished Get Back album, one last song, Harrison’s “I Me Mine“, was recorded on 3 January 1970. Lennon, in Denmark at the time, did not participate. In March, rejecting the work Johns had done on the project, now retitled Let It Be, Klein gave the session tapes to American producer Phil Spector, who had recently produced Lennon’s solo single “Instant Karma!” In addition to remixing the material, Spector edited, spliced and overdubbed several of the recordings that had been intended as “live”. McCartney was unhappy with the producer’s approach and particularly dissatisfied with the lavish orchestration on “The Long and Winding Road“, which involved a fourteen-voice choir and 36-piece instrumental ensemble. McCartney’s demands that the alterations to the song be reverted were ignored, and he publicly announced his departure from the band on 10 April, a week before the release of his first self-titled solo album.
On 8 May 1970, Let It Be was released. Its accompanying single, “The Long and Winding Road”, was the Beatles’ last; it was released in the US, but not in the UK. The Let It Be documentary film followed later that month, and would win the 1970 Academy Award for Best Original Song Score. Sunday Telegraph critic Penelope Gilliatt called it “a very bad film and a touching one … about the breaking apart of this reassuring, geometrically perfect, once apparently ageless family of siblings”. Several reviewers stated that some of the performances in the film sounded better than their analogous album tracks. Describing Let It Be as the “only Beatles album to occasion negative, even hostile reviews”, Unterberger calls it “on the whole underrated”; he singles out “some good moments of straight hard rock in ‘I’ve Got a Feeling‘ and ‘Dig a Pony‘”, and praises “Let It Be“, “Get Back”, and “the folky ‘Two of Us‘, with John and Paul harmonising together”.
McCartney filed suit for the dissolution of the Beatles’ contractual partnership on 31 December 1970. Legal disputes continued long after their break-up, and the dissolution was not formalised until 29 December 1974, when Lennon signed the paperwork terminating the partnership while on vacation with his family at Walt Disney World Resort in Florida.
From Wikipedia:
On 10 April 1970, in the midst of business disagreements with his bandmates, McCartney announced his departure from the group. He filed suit for the band’s formal dissolution on 31 December 1970. More legal disputes followed as McCartney’s attorneys, his in-laws John and Lee Eastman, fought Lennon, Harrison, and Starr’s business manager, Allen Klein, over royalties and creative control. An English court legally dissolved the Beatles on 9 January 1975, though sporadic lawsuits against their record company EMI, Klein, and each other persisted until 1989.
After the Beatles’ break-up in 1970, McCartney continued his musical career with his first solo release, McCartney, a US number-one album. Apart from some vocal contributions from Linda, McCartney is a one-man album, with Paul providing compositions, instrumentation and vocals.
I woke up and didn’t have a job anymore! Oh Jesus! No band. What do I do? I’ve got to work out something for myself now.
Paul McCartney
Let It Be / You Know My Name (Look Up The Number)
By The Beatles • 7" Single
The Long and Winding Road / For You Blue
By The Beatles • 7" Single
How The Web Was Woven / Thumbin' A Ride
By Jackie Lomax • 7" Single
By Badfinger • LP
By Ringo Starr • LP
The Magic Christian (Original Soundtrack Album)
By Various Artists • Official album
1970 • For The Beatles • Directed by Michael Lindsay-Hogg
1970 • For Paul McCartney • Directed by Charlie Jenkins