If you were playing Name that Tune, which songs would you pwn with?

[coffeecrazy1]

Remember Name that Tune, where you had to say how many notes it would take for you to recognize a certain piece of music? Which songs would that be for you? Can be any genre...but I'm going for which songs are the most instantly recognizable, the moment they start playing. Also...say how many notes it would take you to do it.

Sweet Child O'Mine(1 note)
Clair de Lune(2 notes)
Also Sprach Zarathustra(3 notes)