Last winter, Blake Shelton, Jason Aldean, Little Big Town and Luke Bryan paid tribute to country group Alabama during a taping of CMT Giants. An air date and full lineup for the broadcast has just been announced. Nearly a dozen performers are slated for a two-hour TV special airing Aug. 15 at 8PM ET. CMT Giants has been celebrating the best in country music since 2006.Vince Gill, Charley Pride, Kenny Rogers and Alan Jackson are a few artists who’ve been featured.CMT Giants: Alabama was filmed at Belmont University’s Fisher Center for the Performing Arts in Nashville.Related: 15 Country Legends…