By Brandy McDonnellOklahoma natives Carrie Underwood, Garth Brooks and Reba McEntire, along with fellow country music superstars Dolly Parton and Chris Stapleton, talk about what country music means to them in the reverent first promotional video for the 53rd Annual CMA Awards.As previously reported, the CMA Awards will broadcast live from Bridgestone Arena in Nashville at 7 p.m.Read more on NewsOK.com