If You Don’t Know Me by Now by Simply Red was released on March 27, 1989, with Move on Out as the B side. It was a single from the group’s third album A New Flame. The song was originally recorded and released in 1972 by Harold Melvin & the Blue Notes.
The song reached No. 1 on the Billboard Hot 100 and Adult Contemporary charts. It was also a No. 1 hit in Australia and New Zealand. In the United Kingdom, it reached No. 2.
If You Don’t Know Me by Now later appeared in the 2000 movie American Psycho but was not included on the soundtrack for the film.