Senior Citizens, what song does one wish one had written?

Probably ' Margaritaville ' The song was a monster hit for Jimmy Buffet, and he then came back later and had another huge hit on the same song when he teamed up with Alan Jackson. I don't believe anyone's ever gotten as much ' mileage ' out of a song as Buffet's gotten out of that one. Not only could I have a nice, little nest egg with that one, but I could be quite rich !