The smartest move in the making of Gram Parson's posthumously released 1974 sophomore album is Emmylou Harris' promotion from backing singer to full-fledged duet partner—with the deliciously painful "Love Hurts" and "Hearts on Fire" immortalizing their rapport. Elvis Presley bandmembers add a barroom kick to "Ooh Las Vegas," while "Return of the Grievous Angel" and "In My Hour of Darkness" best manifest the country rocker's tragic magic.