Once a Temptation, always a Temptation might be the motto for explosive vocalist Dennis Edwards, who's joined, left, and re-joined the group three times. Edwards was born in Birmingham, but his family moved to Detroit when he was seven. As a high school student, Edwards sang with the Crowns of Joy gospel group, then formed a soul-jazz band called Dennis Edwards & the Firebirds, inspired by organist Richard "Groove" Holmes. Motown bass legend James Jamerson heard Edwards singing one night and suggested he audition. They needed a lead singer quickly for the Contours, and his...