Katy Perry used to sing rock music
Katy Perry . Perry rose to fame in 2008 with the release of the singles `` I Kissed a Girl '' -- which sparked controversy for its sapphic themes -- and `` Hot n Cold '' from her second album , a pop rock record titled One of the Boys . Her third album , Teenage Dream ( 2010 ) , ventured into disco , and contained the U.S. Billboard Hot 100 chart-topping singles `` California Gurls '' , `` Teenage Dream '' , `` Firework '' , `` E.T. '' , and `` Last Friday Night ( T.G.I.F. ) '' as well as the number-three single `` The One That Got Away '' .