Like... all of them. The ~impact~ everyone constantly talks about is an entirely subjective scale that holds no relevance to anything. Same goes for deeming things 'iconic' or 'legendary.'
Oh well then every Gaga and Britney song. I do recognize how effortlessly iconic what they do is in the gay community, but that's far from being te same outside it.
Drunk In Love and ***Flawless. Supposedly impactful and iconic because of their lyrics (which did not even end up in google's top 10 most searched lyrics).
All I want for christmas. Sorry but it's natural for xmas jingles to chart high in this season. It might do it best but that doesn't make it the biggest female classic of all time.