There’s almost no wrong time to eat pizza. It’s a perfect dinner option, great for a quick lunch and hits the spot as a cold breakfast.

But the incongruently-named Canadian pizza chain Boston Pizza is turning their pies into proper fare for the holidays. A new Christmas pizza features turkey, cranberry sauce and gravy. Also cheese, because it’s a pizza.

To get the word out, agency John St. enlisted pizza-crazed carolers. The seven-member choir sings an ingredient list and explains the obvious—that it’s a turkey dinner on a pizza—all to the tune of “Carol of the Bells.”

If that earworm isn’t enough, select customers are also receiving their pizza in a musical pizza box that plays the song when the box is opened.

There’s even a Spotify track, for those who can’t get their hands on the box. John St. has a history of embellishing Boston Pizza boxes, turning the little plastic pizza saver into patio furniture and making a grease-stained Ouija board.