WHEN “REMEMBER WHEN” PLAYED AT ALAN JACKSON’S FINAL CONCERT, FAMILY MEMORIES FILLED THE NIGHT—AND THOUSANDS OF PHONES LIT UP THE STADIUM. More than 80,000 people had gathered at Nashville’s Nissan Stadium to watch Alan Jackson close the touring chapter of his life. The night had already given them country music royalty. Carrie Underwood sang the songs that had inspired her as a child. George Strait walked out beside Alan. A storm delayed the music, but the crowd stayed. Then Alan began “Remember