After stealing the title of favorite Singer-Songwriter, Marina + the Diamonds is going head-to-head with Electronic artist champ Calvin Harris. Which superstar will move on the the championship round?

Marina + the Diamonds boasts powerhouse vocals and some serious songwriting chops! Her fanbase is really pulling for her -- being that the last round was the second time she won by a landslide. Will her momentum be enough to beat Calvin Harris?

The Scottish DJ became a household name after collaborating on 'We Found Love' with Rihanna, but he's also worked with Ellie Goulding and Florence Welch of Florence + the Machine. Does he have what it takes to go up against Marina?

Who's your pick to move onto the finals: Marina + the Diamonds or Calvin Harris? You can vote once per hour below until the poll closes on Aug. 28 at 2PM ET.

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