Actually, the title is only 25 percent accurate, because the Country Music Association Music Festival (that title comes, surely, from Mad magazine's Department of Redundancy Department) actually unfolded over four days, back in June. But there are indeed some high-energy, rocking performances on tap here, including a duet featuring Miranda Lambert and Carrie Underwood that’s a little bit country, a little bit rock and roll, and a little bit hot pants.