I Kissed A Girl
Waking Up In Vegas
Thinking of You
Mannequin
Hot & Cold
If You Can Afford Me
Teenage Dream
California Gurls
Firework
The One That Got Away
Hummingbird Heartbeat
Not Like The Movies
Wide Awake
Walking on Air
Dark Horse
Witness
I tried to get into Katy Perry many many many times before and I just couldn't do it. I felt her music was good, didn't hate it, but t I wasn't invested into it at all. When Roar and Dark Horse came out, those two songs were my most played songs of 2013 both were severely overkilled back then, but I still kept on listening and wasn't tired of them. So I'd say Roar and Dark Horse