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!

The votes are really flying in the South bracket, as Linkin Park are building a healthy lead over R.E.M. in the first showdown of the day. Who will the winner of that match-up face in the Sweet 16? One of the two huge acts in the second pairing of the day.

Voting for all second round match-ups will close on Sunday, March 27 at midnight. As always, you can follow all the voting here.

(4) Kings of Leon vs. (5) Paramore

In a battle of the greater Nashville area, Kings of Leon ride their solid first round defeat of Grace Potter and the Nocturnals into the second round to square off against Paramore, who went toe-to-toe with No Doubt for a true heavyweight fight that came down to the wire. With the wind at their backs, will Paramore charge into the Sweet 16, or do Kings of Leon have too much power to be put down? Your votes will decide it!

Watch the breakdown of the first round and a preview of round two!

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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.