How about...all of them?
  Lol jk, I don't have the memory for that. XD Alright, let's see: Strawberry Fields Forever, Hey Jude (although I must admit I sometimes mix up the last two verses), Yesterday, Penny Lane...I bet there's more, but my cruddy memory won't allow my access to their names. (Don'tcha hate it when you know you know a song or something, and the words are on the tip of your tongue but you carn't quite think of them? That's annoying for all things, but especially for songs.)