She opened the show with “Dance in the Dark” and hardly took a break until the climactic, floor-shaking performance of “Bad Romance.” My personal fave was “Boys Boys Boys,” which she began by asking, “Where are all the gay boys at?” Obvs, I immediately jumped up and began dancing. But there is no doubt that “Bad Romance” was the ultimate showstopper, with all of Radio City on its feet for Gaga’s hit single. The only downsid e fashion was that Gaga never did one of my fave tunes off The Fame Monster, “Telephone,” but I’ll let it slide. Music Mix-ers, if you have any chance of going to see Gaga at Radio City, I heartily endorse. It could change your life. Or at least just make it really sparkly for a couple of hours.