Katy's peak was bigger than Christina's, P!nk's, and Beyoncé's, and possibly as big as Rihanna's (either GGGB/Loud). It trails behind Britney, Gaga and Taylor's peaks though.
After Go his work took a nosedive in quality i.e. stuff released but a bunch of other popstars this year.
u think he had any say in those? it's obviously their vision and like 20% of his input.
Katy's go is coming. the fact that we're literally gonna be stanning for a soundcloud artist by the time kp4 starts