Since their debut album in 1999, Eddie Montgomery and Troy Gentry have found a formula of country music that hasn't failed them yet, with every one of their studio albums (and a greatest-hits collection) entering their genre's Top 10 charts and being certified gold or platinum. Like many of the duo's contemporaries, Montgomery Gentry specializes in the kind of down-to-earth, good-time rabble-rousing that gives fans a reason to celebrate their rural identity and lifestyle. On the road supporting their most recent album “Back When I Knew It All,” the men bring their stadium-sized twang to Innsbrook Pavilion on Friday, Aug. 14. Gates open at 6 p.m. $18-$20. 217-8803. — Mike Hilleary