Mary Hopkin
"Those Were The Days" was McCartney's choice for Hopkin's first single. He chose well, and the song became a hit worldwide. Hopkin recorded other singles, including "Goodbye", "Temma Harbour", "Knock, Knock, Who's There", and a remake of Doris Day's "Qué Sera, Sera", but they were not as successful as her first record. McCartney moved on to a solo career after the Beatles disbanded, and no longer worked with her. Hopkin's second album, Earth Song/Ocean Song, was largely self-produced.