going by TIHWD and BD's czart performance, and the hit/flop ratio for Spirm, Katy's next era will flop really, really hard. Like "4" level of floppage for singles with like half the album sales.
top 10 hits since january 2012:
rihanna 6
katy perry 5
ariana grande 5
miley cyrus 2
selena gomez 2
christina aguilera 2
demi lovato 1
lady gaga 1
madonna 1
britney spears 1