If You Don't Know Me by Now - David Clayton-Thomas

"If You Don't Know Me by Now" is a song written by Kenny Gamble and Leon Huff, and recorded by the Philly soul musical group Harold Melvin & the Blue Notes. It became their first hit after being released as a single in September 1972, topping the US R&B chart and peaking at number 3 on the US Billboard Hot 100.

"If You Don't Know Me by Now" has since been covered by a number of other artists.

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