Nearly thirteen years after her first big hit, Britney was somehow still on top of the world. Off her seventh album, Till The World Ends was a commercial and critical smash one that cemented Britneys legacy of hits with a rumble of its chant-like chorus. Numerous publications named it one of the best tracks of 2011, with Rolling Stone ranking it at #3, and just a couple of years later pop radio is already trying to recreate the songs inescapable hook. This is what nearly a decade and a half of pop domination sounds like.