Perhaps the pervasive element of tragedy that ruled Marvin Gaye's life accounts for the profound intimacy found in his songs. He scored dozens of hits for Motown in the 1960s both as a solo act ("How Sweet It Is (To Be Loved by You)," "I Heard it Through the Grapevine") and singing duets ("Ain't No Mountain High Enough"). A late-decade period of depression and solitude ended with What's Going On? (1971). That album eschewed the pop frivolity of Gaye's earlier work, grappling...  [+]