The Elite Eight has arrived! With two match-ups today and two tomorrow, we are only 48 hours away from the Final Four. Who will stay alive? Our first Elite Eight match-up features two underdogs who have fought hard to make it this far - one will make it even farther. It's a BO4 Elena Siegman Showdown as "Mystery" takes on "Shockwave." Which song is better? That's up to you! Vote for your favorite, then wait and see who finesses their way into the Final Four. Voting will last approximately 24 hours.