Ryan Adams Played Bluegrass Covers of Slayer and Black Sabbath at Newport Folk Festival

Ryan Adams is apt to cover just about anything. Performing at the Newport Folk Festival yesterday with the Infamous Stringdusters and Nicki Bluhm, he opted for metal: Slayer's "South of Heaven" and Black Sabbath's "The Wizard." As it turns out, both are surprisingly well-suited to the Stringdusters' bluegrass-y take. Adams also improvised a new song, "Frightened…