 A top ten hit in 1984, Old Man Down the Road. 43-year-old John Fogerty is at number 21 in our countdown. This is the Triathlon of Rock and Roll, a special edition of American Top 40. I'm Casey Kasem. We're counting down the 40 top artists with careers spanning three decades on our way to the number one artist of all. The 20 biggest longevity leaders are coming up.