If You Don't Know Me By Now

You've probably heard this song recently sung by Seal on his album Soul. But perhaps you first discovered the recording by the Philadelphia soul group Harold Melvin & the Blue Notes (1972). Or maybe it was the Patti LaBelle version featured on her 1985 album Patti? Of course, it also hit number one onthe U.S. charts in 1989 when sung by the English pop/soul band Simply Red. Talk about a song that has legs!