Board Thread:Spoilers!/@comment-25926288-20170203182557/@comment-24674051-20170203183530

hard to say, but my guess is that it is NOT the musical ep. given that we've been told that the musical numbers would be original, that would be hard to sell in an episode entitled "Where Bluebirds Fly", which is a line from a long established musical number.

Another thought that I had was this could also be a Snow(ing) episode, since bluebirds are also associated with Snow White. But I'm still leaning towards an Oz centric.