The absolutely amazing thing about McCartney is that he has many signature songs!
Silly Love Songs has been referenced in many different ways for years now. I've seen Band On The Run used in many different media, Maybe I'm Amazed was used by Hallmark on some of their greeting cards, My Love is automatically associated as the Linda connection, Live And Let Die, etc.
It gets overlooked and doesn't get the true credit it deserves, but the truth is McCartney doesn't have just one signature song but many!