WHO: Miranda Lambert, Parker McCollum, and the iconic George Strait. WHAT: A tribute to this year’s Country Music Association’s Willie Nelson Lifetime Achievement Award winner, performed by two stars from the current generation. WHY IT’S SO GREAT: The CMA’s lifetime achievement award—named for its first honoree, Willie Nelson—isn’t the sort that gets handed out easily. The association doesn’t run down a list and simply pick the next name in line. It was first issued in 2012, but some years, there isn’t an awardee. Last night in Nashville, though, the ninth performer (and third Texan) to be presented with the prize got an all-star tribute as part of the CMA Awards ceremony. We’re talking, of course, about George Strait, the seventeen-time CMA Award winner and legendary King of…