Dolly Parton, at age 68, creates her best album in more than a dozen years by returning to the bluegrass-flavored sound that worked so well for her at the turn of the century."Blue Smoke" succeeds partly because the Country Music Hall of Fame member's songwriting pen remains sharp. "Unlikely Angel" and the family melodrama "Miss You-Miss Me" join the three-part harmony of the title cut in adding to Parton's considerable legacy as a songwriter.The emphasis on banjo, fiddle and gospel-style harmony is reminiscent of 1999's "The Grass Is Blue," a Parton career highlight. Her update of the traditional murder ballad "Banks Of The Ohio" fits the bill, too.But Parton expands her musical palette with two risky covers.