The quartet's commercial momentum continued with their third album.
Their new US hit of August 1979 was a song that had been very good to some of the group 11 years earlier.
As technology has advanced throughout the decades, artists have pushed music into the future.
The Alabama soul man recorded a host of other great material in his long career.
Legendary record producer and Muscle Shoals studio pioneer Rick Hall, who worked with Aretha Franklin and many more has died aged 85