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About Knock, Knock Who's There?
"Knock, Knock Who's There?" is a song written and composed by John Carter and Geoff Stephens, released on Apple Records. It was originally sung and recorded by the Welsh singer Mary Hopkin and represented the United Kingdom in the Eurovision Song Contest 1970, where it came second. The single version was produced by Mickie Most and reached No. 2 on the UK charts.
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