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Knock Knock Who's There is simply a wonderfully crafted pop song, both lyrically and musically, and Mary's voice sounds just great.
The song featured in the excellent BBC drama Blackpool where the guarded optimism of the lyrics, along with the lightness and playfulness of the melody, neatly juxtaposed with the beginnings of an obviously doomed affair between the main protagonists and served to accentuate the plays darker emotional and social themes.
There, who said I couldn't write meaningless twaddle.
Listen: Knock Knock Who's There - Mary Hopkin