Robyn

She looks like Posh, she sang backup for Britney, and she sounds like Kylie -- at least on this 2005 Swedish club hit (released to much success in the UK in 2007 and, finally, stateside in '08). In short, you should expect to start hearing the throbbing bass, glassy production and icy vocals of "With Every Heartbeat" pumping out of the sound system at any dance venue featuring flashing lights and/or shirtless men, if you haven't already.