What are the best song intros of all time?

van halen

Hannah Jane Parkinson writes: It's one of the most important elements of a piece of music; it can raise a good track to a great one, and a great one to a sublime one. If you hear the intro to a much-loved track in a club it'll raise heartbeats and hands; if you're drinking coffee in some corner of France and the opening chords of a song you heard years ago start drifting from a jukebox, they'll act as a Proust's madeleine; and the tinkle of a piano can send chills up your spine if it was the first dance at your wedding.