It must be weird to be thinking about “Jingle Bells” when Halloween pumpkins haven’t even started to rot. But that’s business as usual for Arlington’s arena-packing Pentatonix, which releases Christmas in the City on Oct. 24.

Its eighth yuletide album – and first for Republic Records after a decade with RCA – includes “Bah Humbug,” a witty retelling of Dickens’ A Christmas Carol , co-written by singer Scott Hoying. The quintet also pulls off a virtual collab with Frank Sinatra on the Irving Berlin chestnut “I’ve Got My Love to Keep Me Warm.” Ol’ Blue Eyes first cut the tune on his ’61 album Ring-a-Ding-Ding!

Republic Records

Formed in 2011 by three pals from Arlington’s Martin High School, Pentatonix has evolved from a pop curiosity into the most commercially successful a capella g

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