With a purring alto and a gift for poignancy, k.d. lang's musical mettle goes far beyond her hits. She made the journey from the humor-tinged country of “Diet of Strange Places” to the lush balladry of “After the Gold Rush,” via the smooth, sultry jazz of Tony Bennett collab “Dream a Little Dream of Me” and the Fitzgerald cover “Angel Eyes.” Her deeply interpretive vocals and emotional honesty tie it all together.