lead vocals in "Winter Wonderland" / "Don't Worry Be Happy" Andrew Kesler – string producer on "Mary, Did You Know" (featuring The String Mob) Ed Boyer – mixing Bill Hare – mastering Charts Weekly charts Year-end charts Decade-end charts Certifications See also List of Billboard Top Holiday Albums number ones of the 2010s References 2014 Christmas albums A cappella Christmas albums Christmas albums by American artists Pentatonix albums RCA Records Christmas albums