So what do you think of Sia (Songbird Serenade)? in My Little Pony: The Movie Posted February 16 Well, I do live under a rock, and I don't know anything about her beyond what we saw in the movie. Having her there was a crass marketing move, her songs and general existence had nothing to do with the movie's plot, although at least they kept her involvement to a minimum. I'm not into pop, and I didn't care for her music in the movie. Of course, the movie wasn't all that great to begin with. Cute pony design, though.