Who has the best hard rock hit of the 21st Century? Your votes have helped narrow the field and we're now up to this Quarterfinals of our Rocktober Rumble tournament.

Avenged Sevenfold's "Nightmare" got here by scaring up a close victory over Slipknot's "Duality" just after their first round win over System of a Down's "Chop Suey." The track enjoyed one of their strongest runs at rock radio back in 2010 and has become a fan favorite. Take a listen below.

Tool's "Schism" has handily dealt with the challengers, besting Deftones' "Change" in the first round and most recently taking down Disturbed's "Down With the Sickness." Like "Nightmare," the song topped out at No. 2 at radio, but the Best Metal Performance GRAMMY-winning song has remained a radio favorite over the years.

Who will advance? That's up to you. You can vote once per hour through the deadline of Tuesday, Oct. 25 at 10AM ET. So make those votes count.

Avenged Sevenfold, "Nightmare"

Tool, "Schism"

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