As I understood it, Bill Withers recorded "Ain't No Sunshine" with "dummy lyrics." The "I know"s were to have been replaced with actual lyrics once the song was (re)written, but the producer or someone liked it just the way it was, and decided to release it "as is." And now you know.
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"I know, I know, I know........."
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"I know, I know, I know........."