As we hit the second round of the March Metal Madness 2014 tournament, we start to see albums that truly defined metal in the 21st Century begin to emerge. This matchup in the Mosh Pit Region is no different as two stellar efforts have moved one step closer to being named the best metal album of the 21st Century.

In one corner, we've got those melodic death metal Vikings from Sweden -- Amon Amarch. The band's 2006 album, 'With Oden on Our Side,' earned a victory over Anthrax's 'Worship Music' in the first round and advances to fight another fight. The disc, which was the band's sixth overall, features such standout cuts as 'Runes to My Memory' and 'Cry of the Blackbirds.'

Amon Amarth square off against Slipknot's 'Iowa,' which truly found the band entering rarified air in the metal genre. The unrelenting 2001 disc earned the band a pair of Grammy nominations and generated a fair share of live staples. Such songs as 'The Heretic Anthem,' 'Left Behind,' 'People = S---,' 'My Plague' and 'Disasterpiece' have become key songs in the band's legacy.

Now it's your turn. Vote for which 21st Century metal album you feel is the better one. It's Amon Amarth's 'With Oden on Our Side' versus Slipknot's 'Iowa' in this March Metal Madness 2014 matchup. Vote below.

(This poll will end on Sunday, March 16 at 11:59 PM EST. Fans are able to vote once per hour, so keep coming back to make sure your favorite album wins!)