Best Song Ever Written?

We listen to a classic rock music station in my office all day every day and a question occurred to me while listening today.  What would you consider the best song ever written?  That's it, no limitations, no stipulations, no additional information needed.  As I mentioned, we listen to classic rock at work all day and I listen to country music most of the time I am in my car.  I also listen to a bit of a variety when it comes to my vinyl record collection but lately it's mostly folk or "easy listening" type stuff like John Denver.  Anyway, as I pondered how I would respond to this question over the course of the day in between tasks there was only one possible answer that came to mind...

So...what would your answer be?