Willie Nelson doesn’t want to be the last man standing, he declares on the title track of this new album, made up of eleven original songs co-written with producer Buddy Cannon. After a moment’s consideration, he adds: “On second thought, maybe I do.” — The song is a wry concession to an overshadowing truth that accompanies Willie Nelson and his music every step at this stage of his life: He’s an 84-year-old man who is one of America’s most preternaturally active and creative artists, and he keeps on going. He still performs something like…