A preeminent R&B singer, Al Green specializes in a smooth soul that has found common ground between the carnal and the spiritual. Green's sensual falsetto found its match in the tight, immaculate Memphis funk shepherded by Willie Mitchell, the head of Hi Records who signed the Grand Rapids, Michigan singer after "Back Up Train" broke out of its regional hit status in 1967. With Mitchell behind the boards, Green released a series of albums that showcased how he developed into an exceptional interpreter of modern standards -- their first big hit was a transformation of the Tempt...