Fan Army Face-Off: Which Army Is Strongest? The Final Four

Round 4 of Billboard's Fan Army Face-Off is now open! The final four teams competing are -- Tokio Hotel's Aliens, Thiry Seconds to Mars' Echelon, Skillet's Panheads and BIGBANG's VIPs.

Check out Rounds 1, 2, and 3, and click here to see the full bracket. Voting closes on August 3.

Fan Army: The Aliens
Artist: Tokio Hotel
Twitter to watch: @TokioHotelUSA

Fan Army: The Echelon
Artist: Thirty Seconds to Mars
The band on their fans: "If it wasn't for the Echelon, we wouldn't have ever won a single award. I think that's the blessing of living in this digital age, is that people have a voice, and the Echelon Nation out there has made their voice heard again and again, and we're so proud that they're able to gather together, to organize themselves, to fight for a common cause and to make dreams a reality. It's pretty special."

Fan Army: The Panheads
Artist: Skillet

Skillet on their fans: "The fans are the reason we're here. I love having all different types of fans."

Fan Army: The VIPs
BIGBANG on their fans: "We are extremely thankful to all the fans... We would like to continue visiting various countries around the world and to meet every BIGBANG fan out there. In order to do that, we have to constantly evolve and challenge ourselves and grow as artists. We hope that all of you will support for us."