After recording “Have Yourself a Merry Little Christmas” in 2013 and holding annual Christmas in the Vines concerts, Pene Pati, Amitai Pati, and Moses Mackay make spreading holiday cheer an official part of their résumé. The Kiwi trio lend their harmonies to beloved classics as well as contemporary favorites like John Lennon’s “Happy Christmas (War Is Over)” and The Pogues' “Fairytale of New York.”