Swamp Ophelia

With their glassy voices and vigorously strummed guitars, the Indigo Girls offer now-familiar fare. The duo’s sixth major-label album, Swamp Ophelia, adds some interesting side dishes, like ”Touch Me Fall,” whose orchestral swipes resemble, for better or worse, the Moody Blues jamming with Pink Floyd. The rocking ”This Train Revised” is the most driving, coherent cut, thanks to an Appalachian fiddle and a keen use of dynamics. Otherwise, their college-poetry lyrics and wandering melodies are still keeping them from becoming Indigo Women.