Katy Perry music is iconic and remains relevant years later, she is up there with legends spawning so many no,1s from a album tieing her with Micheal Jackson. Gaga is more gimmicks we will see her plastered on every newspapers falling out of nightclubs, wearing busted clown outfits, using her fans who she doesn't care about she's all about the money, ask her ex colleagues. Gaga was only good when Laurie Gibson who also created Danity Kane was the mastermind her debut album. Katy Perry music will do the talking but I would not be surprised if her label sell her single album for $1 like Born this way just to get the numbers in, as we all know her millions of followers are actually fake most are bought just to give the most twitter followers. Katy Perry will reign.