Firework is probably the one that comes closest. Classic songs are something greater than a #1 single.
They have to make an impact and be something that people remember and want to listen to time and time again. It has to be timeless. And there aren't many songs like that in the past decade.
I think her only classic is Firework. When I think of classics I think of..... "Thriller, Crazy in Love, Unbelievable, Yeah!, Rolling in The Deep" to me Firework that is the only song that could stand the test of time all her other songs were just quick songs to reach #1.
