Lady Gaga exploded in 2008 with a simple mantra: Just dance. Through sublime singles, meat dresses at MTV Video Music Awards, egg hatchings at the Grammys, an Oscar win, duets with Tony Bennett, and oh so, so much more, Gaga has (purposefully) muddied that mantra. Gaga's current tour – The Chromatica Ball, which stopped at Fenway Park on Friday night – does get back to the dancing. But instead of just dance, it's dance and think, dance and cry, dance and marvel at the P. T. Barnum-on-acid spectacle of it all. And, in its best moments, it's sit down and just listen. Like in the past with Gaga, that spectacle can threaten to crowd out the pop. Towers of fog, a dozen dancers, video screens as tall as the Green Monster, more pyro than Motley Crue, Gaga singing while enveloped in a cocoon straight out of Tron and stuck on a slowly rotating lazy Susan. This was the first song, "Bad Romance." The spectacle was one of the biggest, boldest ever put on in Fenway. But...