‘Knock, Knock Who’s There?’ by Mary Hopkin peaks at #92 in USA 50 years ago #OnThisDay #OTD (Dec 23 1972)

(Saturday, December 23, 1972) — “Knock, Knock Who’s There?” by Mary Hopkin peaked at #92 on today’s Billboard Hot 100 singles chart for two weeks.

The single was released on The Beatles’ official record label, Apple Records.