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In page Pat Friday:

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Friday was a "ghost singer" who dubbed songs for Lynn Bari and was never credited.[citation needed] She sang "I Know Why (And So Do You)", the original vocal version of "At Last", and "Serenade in Blue" in the Glenn Miller movies Sun Valley Serenade and Orchestra Wives.[1] She also was heard as a singer on the radio in The Story of G.I. Joe (1945).[2]