1. Lady Gaga, "Bad Romance"
Lady Gaga became the strangest element of pop in the 2000s with her daring, high-fashion looks and out-of-the-box take on pop tropes. When "Bad Romance" rolled around, the song and video declared that she was more than just a flash-in-the-pan pop phenomenon and established her as one of the most innovative thinkers of the genre. The video made the strongest case, with the singer emerging from a pod into a sterile room filled with dancers and a number of luxe looks like the glamorous alien for which she was known best.