This is what we found on Wikipedia regarding the Lee Fields:

Elmer Lee Fields (born April 26, 1950) is an American soul singer, sometimes nicknamed "Little JB" for his physical and vocal resemblance with James Brown. He has worked with Kool and the Gang, Hip Huggers, O. V. Wright, Darrell Banks, and Little Royal. Fields has also worked with musicians such as B. B. King, Clarence Carter, Dr. John, Tyrone Davis, Johnny Taylor, Denise LaSalle, Bobby Blue Bland, Betty Wright, The Manhattans, Little Milton and Bobby Womack. He recorded his first single in 1969 and is still active. His recent work is with The Expressions, including the albums Faithful Man (2012), Special Night (2017), and It Rains Love (2019). In 2014, he provided additional vocals for the James Brown biographical movie, Get On Up.