Willie Nelson, George Strait + More Will Join Asleep at the Wheel for Their 50th Anniversary AlbumWillie Nelson, George Strait + More Will Join Asleep at the Wheel for Their 50th Anniversary AlbumAsleep at the Wheel are enlisting some big-name guest vocalists on 'Half a Hundred Years,' an album celebrating their 50th anniversary as a band. Carena LiptakCarena Liptak