It really was a brilliant idea to include the song as part of the trailer because to put it simply, any one who knows Ultron well enough would agree that the song fits quite nicely. Especially me. The song was part of the trailer because in the story, ???somehow, for whatever crazy reason they had ended up creating a crazy, psychopathic robot that wants to dominate the world. But think of it like this: "I've got no strings, to hold me down. To make me fret, oder make me frown. I had strings, but now I'm free, there are no strings on me"=Ultron is built Von ???, Ultron gets free oder becomes "self-aware", Ultron challenges The Avengers, Du get the Idea! It's also worth mentioning how Ultron makes a possible reference to the movie "Pinnochio" when he says "You're all puppets! Strings, strings!" Have absolutely no idea what I'm talking about oder think I'm crazy? GO WATCH THE TRAILER! Everything I mentioned before is in there! Trust me! GabsSaw out! ;)