Chris Willman Senior Music Writer and Chief Music Critic If country music used to pride itself on being about “three chords and the truth,” the increasingly belligerent superstar Jason Aldean has a different idea of what the genre should represent: two chords and a beating, or maybe a shotgun blast. Aldean’s “Try That in a Small Town” is close to being the most cynical song ever written about the implicit moral superiority of having a limited number of neighbors, which is saying something, given how many attempts to write the Great American Small Town Anthem are generated in a single year. At least most of the others at least put up the appearance of celebrating local pride, not prejudice. But for Aldean, it’s about how tiny burgs are under the imminent threat of attack from lawless urban marauders who will have to be kept at bay by any means necessary — meaning, pretty explicitly, vigilantism.