On this day in music history: November 18, 1972 - “If You Don’t Know Me By Now” by Harold Melvin & The Blue Notes hits #1 on the Billboard R&B singles chart for 2 weeks, also peaking at #3 on the Hot 100 on December 9, 1972. Written and produced by Kenny Gamble and Leon Huff, it is the first major hit for the Philadelphia, PA vocal quintet. Lead singer Teddy Pendergrass initially joins The Blue Notes as their drummer, but is moved to the front and center of the group when Harold Melvin discovers that he can sing. Harold Melvin & The Blue Notes is among the first acts signed to Gamble & Huff’s Philadelphia International Records in 1971. “If You Don’t Know Me By Now” is originally written for the Chicago based R&B group The Dells, but does not end up recording it when a deal with their record label cannot be reached. Instead, it is given to The Blue Notes and is released as their second single, becoming an immediate smash on both pop and R&B radio. The success of “If You Don’t Know Me By Now” marks the beginning of a hit streak Harold Melvin & The Blue Notes have, turning Teddy Pendergrass into a star prior to launching his own solo career in 1977. British band Simply Red covers the song in 1989, taking it to number one, belatedly winning Gamble and Huff a Grammy Award for Best R&B Song in 1990. “If You Don’t Know Me By Now” is certified Gold in the US by the RIAA.