If You Don't Know Me By Now

Harold Melvin & The Blue Notes

The Philadelphia International team of Leon Huff and Kenny Gamble produce a hit for long time R&B soul group Harold Melvin & The Bluenotes with "If You Don't Know Me By Now" which reaches No. 3 U.S. and No. 1 U.S. R&B. An ’80s cover version by U.K. band Simply Red also hits No. 1.