Pitchfork is mostly known for hyper pretentious music reviews and the hipster-iest of America’s summer music festivals, but this year’s headliners have been announced and it’s got plenty of appeal beyond the vinyl-only crowd. Kendrick Lamar, Beck and Neutral Milk Hotel will be leading the charge, and that’s reason enough to go right there. But Grimes, Tune-Yards, Sun Kil Moon and Slowdive will be there too, which makes this Pitchfork’s strongest lineup in ages. It takes place in Chicago July 18-20, and tickets are on sale right now …