CHRIS STAPLETON brought the house down while singing "Tennessee Whiskey" at Nashville's Bridgestone Arena last Friday . . . and he wasn't even on stage. He was in the audience at a performance of TYLER PERRY's "Madea's Farewell Play Tour". It may have been planned in advance. Tyler asked him to stand and sing, and he used a wireless mic. Whiskey Riff posted a couple of videos, and it's pretty cool to see how much the crowd AND Tyler Perry loved it.