Though Fleming is one of the great divas of her era, this isn’t an opera record. Backed by a jazz combo and subtle strings, the sometime soprano shows off a casual, pop-chanteuse side on these holiday songs. The mood is light, but her technique is strong, giving the gently swinging performances real authority. She proves she can hang with Wynton Marsalis’ bright trumpet on “Winter Wonderland” and “Sleigh Ride," and her operatic side peeks out during “In the Bleak Midwinter," a thrilling duet with Rufus Wainwright.