The longevity of Willie Nelson's career isn't hard to fathom. The tours, albums, parties and film roles have rolled and tumbled one after another with the implacable pace of a man trying to feed a Texas-size Jack Daniel's and weed habit and get the IRS off his back at the same time. Now, in between busts, he lends his chops to albums by reggae misfits like Mishka, Western swing stalwarts Asleep at the Wheel and jazzbos like Wynton Marsalis, who even steps aside as Willie takes his millionth solo on Trigger. So don't take the silver-haired stranger for granted. If you or your kids or your grandkids haven't paid your respects, Willie Nelson's Country Throwdown in Sparta, Illinois, is just across the river. You're gonna miss him when he's gone, but he's not gone yet.