A sorcerer appears and states that they will erase any one song from existence - which song would you choose?
This ability of the sorcerer will wipe any one song of your choosing from the pages of history, as if it never existed! Gone from our reality. They were going to do it anyway, but they're making you choose.
Which song would you pick?
(If you really can't narrow it down to one, then try narrowing to three)
It'll be just like movies and TV shows for the 80 years that Warner/Chappell music claimed they owned the rights. Most of them will probably be variations of "For He's a Jolly Good Fellow"