Bob Dylan, popular music's ultimate shape-shifter, will release the strangest album of his five-decade career next Tuesday, October 13. Christmas in the Heart, as the title suggests, is a collection of 15 holiday classics. Commenters at RollingStone.com and numerous other sites are -- or at least were -- convinced the record would be some kind of cynical joke. But judging by snippets leaked here, Dylan's performances are stirringly sincere. (And, no, he's not trying to make a buck crooning carol