Pentatonix, an American a capella group known for their covers of pop songs and holiday classics, was formed in 2011 after a successful run on TV singing competition series “The Sing-Off.” Pentatonix ...

Love it or hate it, “The 12 Days of Christmas” is a staple tune of, well, Christmas. Singing it over and over again, or perhaps yucking it up to a popular parody, is one of many favorite Christmas ...