Stream: Britney, Ke$ha and Nicki Minaj - Til the world ends (Remix)

I am hardly the worlds biggest Britney fan (and even less of a Ke$ha fan), but Ms Spears just can't stop cranking out reliably danceable pop year-after-year-after-year.  Granted, this is a remix, so not all the credit should go to Brits, with the slick (albeit familiar) production being helmed by super producers Max Martin and Dr Luke.