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For the past 13 years, Pentatonix has been as much a part of the holidays as egg nog, Santa Claus and sale-of-the-day emails.

The Texas-formed a cappella quintet, which landed a recording deal after winning “The Sing-Off” in 2011, has released seven Christmas albums so far. plus several holiday-themed EPs and compilations. This year’s “Christmas in the City,” meanwhile, finds the group working with a full orchestra on seasonal classics — including “I’ve Got My Love to Keep Me Warm” with Frank Sinatra’s vocal grafted into the recording — as well as a fair number of originals and a pair of medleys.

That, of course, means Pentatonix is on the road for the holidays, too, focusing on the new album but still drawing from its litany of Christmas rec

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