POP:Katy VS Rihanna VS Lady Gaga ?

For me
1- Katy Perry
2- Rihanna
3- Lady Gaga
Update: FOR ANSWER #3
kATY : FIREWORK .. AND ( ALL HER ALBUM IS AMAZING )
RIHANNA : WHAT'S MA NAME AND ALOT MORE
GAGA : POKER FACE ... JUST DANCE .. BAD ROMANCE
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