Welcome to the Semifinals of March Metal Madness 2014! This year, we've been polling the metal universe with the goal of naming the greatest metal album released so far in the 21st century. We're down from 32 albums to just four, so check out the match ups we've got in store for you!

First off, we've got Slipknot's 'Iowa' facing off against Lamb of God's 'Ashes of the Wake.' Both records have undoubtedly shaped the 21st century, but which album will move on to the Final Round?

In our second and final battle of this round, Tool's 'Lateralus' is paired up against System of a Down's 'Toxicity.' Your votes will decide which album survives!

Start voting in the Semifinals of March Metal Madness by clicking the button below!