That would be "Let It Be," released in US on May 18th, 1970, though the band had broken up (bitterly) 1 month earlier...and "Let It Be" was actually recorded 1 year previously (1969), but was shelved because The Beatles didn't think it was very good to begin with, plus they had started working on "Abbey Road," and were concentrating on recording that album...The 4 would never play together again...Beatles Let It Be