Kathy Mattea has always teetered on the Nashville edge with her music. On Roses, her 13th studio album, she pushes the envelope, bringing to the forefront the blending of the Scottish/Irish music found in small doses on her last few albums. "That's All the Lumber You Sent," the first track, screams Celtic, as does the instrumental "Isle of Inishmore." But whatever the musical style, brooding and contemplative lyrics accompany all of the tracks. Mattea's warm alto voice comes across opulently in "The Slender Threads That Bind Us Here" and the Kim Richey remake "I'm Alright." This album isn't the country music of the former Grammy-winner and CMA vocalist of the year, but it wins high marks for creative expression and originality.