Mariah Carey would be the undisputed queen of Christmas had she only released 1994’s “All I Want For Christmas Is You,” her sleigh-bell-dusted ode to a gift-wrapped romance. Over the years, however, the pop diva’s love for the holidays has grown to legendary proportions. Chalk this up to Carey’s unabashed affection for every kind of festive music: throwback rock with a girl-group twist (“Lil Snowman”), fanciful R&B (the gospel-tinged original “Oh Santa!”), and even Christmas carols capturing the true reason for the season (“O Holy Night”).