I recently watched the fabulous documentary “STAX: Soulsville U.S.A.” In it, the incredible HBO production told the extraordinary story of the influential and groundbreaking Memphis studio. I loved revisiting the hey-day of such remarkable artists as Otis Redding, Booker T and the MG’s, Sam and Dave, The Staples Singers and the iconic music each made. However, one artist really got my attention. And not just because of their place within the STAX universe.