Ever heard Eddie Vedder sing Neil Diamond? That alone is reason to check out Song Sung Blue, an alternately hilarious and heartwrenching documentary that screened at IFF Boston. The movie follows the ups and downs of a husband-and-wife Neil Diamond cover band called Lightning and Thunder. Vedder joined the "America's Singing Sweethearts" on stage at Milwaukee's Summerfest in 1995 for a rousing rendition of "Forever In Blue Jeans," a Diamond classic that Vedder needed a......