"Abbey Road" proved to be the Beatles' last true collaboration, but Klein recognised an opportunity in the band's shelved January 1969 album and related documentary project, both titled "Get Back", to get another album release out of the splintered group while also fulfilling their obligation to provide one more film to United Artists, the studio that had previously released both "A Hard Day's Night" and "Help!" Phil Spector, the producer famous for his "wall of sound" recordings with artists such as the Ronettes and the Righteous Brothers, was eager to sign on as producer for the album, which was eventually titled "Let It Be". McCartney didn't approve of Spector, but the other Beatles did. This proved to be McCartney and Klein's last face-to-face meeting. However, Apple made $6 million in the first month following the May 1970 release of the record and the film.