What is the Best Hard Rock Hit of the 21st Century? That's what we're trying to find out in this Round 1 battle of the Rocktober Rumble tournament.

In this matchup, you've got Evanescence and their monster single "Bring Me to Life" on one side. The track paired up the soaring vocals of Amy Lee with guest vocalist Paul McCoy of 12 Stones fame, and proved to be the tune that launched their career. The song, released in 2003, went on to win the Grammy for Best Hard Rock Performance. Take a listen below.

On the other side of this pairing, you'll find Thirty Seconds to Mars and the song that finally made them radio favorites, "The Kill (Bury Me)," off of their album A Beautiful Lie. The song enjoyed one of the lengthiest stays ever for a single at radio, commanding the airwaves for the better part of the year in 2006. Take a listen in the player below.

So who will it be -- Evanescence or Thirty Seconds to Mars? You can vote once per hour for your favorite hard rock single of the 21st Century through the deadline of Monday, Oct. 17 at 10AM ET. And be sure to vote in the other matchups by clicking the red button below.

Evanescence, "Bring Me to Life"

Thirty Seconds to Mars, "The Kill (Bury Me)"

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