Billy Paul

Billy Paul (born Paul Williams; December 1, 1934) is a Grammy Award winning American soul singer, most known for his 1972 number-one single, "Me and Mrs. Jones" as well as the 1973 album and single "War of the Gods" which blends his more conventional pop, soul and funk styles with electronic and psychedelic influences. He is usually identified by his diverse vocal style which ranges from mellow and soulful to low and raspy.

source: Wikipedia