Early in the 1990s, the surviving Beatles completed a documentary series telling their own history. George Martin, their original producer, could not play as big a role as he had, because he had lost some of his hearing. Lynne was chosen to work with them. Yoko Ono handed over demos of five unfinished John Lennon songs, and two were chosen for the rest of the band to overdub (add parts to). Lynne used his studio knowhow to develop finished records from the raw demos, and the songs became hits, over twenty years since the Beatles issued a new recording.