It's MTV's second annual Musical March Madness! MTV News took the 64 biggest names in rock, split them up into four regions, assigned them seeds and puts them up against one another in a single-elimination series of match-ups in a winner-take-all contest. We're leaving it to you to decide an actual champ in this field of 64, so over the next few weeks, fan voting will determine who will emerge as this year's champion. It's all about the fans, and the artist with the most passionate fan base will score the awesome Musical March Madness trophy!

Now that was intense! The regional finals in MTV's Musical March Madness was as hard-hitting and cutthroat as it has ever been, and now only four bands remain standing. One of them will be crowned Musical March Madness champion, and each one makes a compelling case for that number one spot.

Voting for all Final Four match-ups will close on Sunday, April 3 at midnight. As always, you can follow all the voting here.

(3) Green Day vs. (9) Disturbed

In the Elite Eight, Green Day took an early lead on spry rivals Panic! at the Disco, and though the Panic boys closed the gap towards the end, Green Day tapped into their veteran instincts and finished off their opponents for a decisive victory in the West. Meanwhile, Disturbed went 12 rounds with defending champs Coheed and Cambria. There were over a dozen lead changes and a handful of late surges by both squads, but in the end, Disturbed managed to topple Coheed and Cambria by an extremely slim margin to deliver the 2010 winners their first ever Musical March Madness loss. With the Midwest in their pocket, can Disturbed continue their winning ways, or will Green Day's momentum carry them into the finals? Your votes decide it!

Watch Dick Bagwell and Vincent Twice unveil the Final Four!

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Check out the Musical March Madness bracket and be take a look at the hoops-centric photos of some of the tournament's biggest bands.