Christmas carols. We all think we know the words to them, but have you actually ever tried singing some of them the whole way through? The cast of Glee was charged with this very task, and the results ended up being pretty dismal.
Only two of the Glee stars can actually sing the tune the whole way through, and one of them is Melissa Benoist (Marley) — who actually sings the song during Glee's Season 4, Christmas episode — so we're pretty sure that shouldn't be allowed to count. So which Glee star can claim the distinction of Christmas carol savvy? Watch the video to find out.