New Lineup.

This year's Bonnaroo lineup will be announced today (Tuesday) during a three-hour online extravaganza that starts at 12 noon ET at Bonnaroo.com and on YouTube.

Billed as B.L.A.M. -- the Bonnaroo Live Announcement Megathon, the first hour will feature live footage from past festivals. At 1 p.m. ET, this year's artists will be revealed. During this hour, fans will have the opportunity to be the first to announce artists via social media by calling into the B.L.A.M. live phone bank at (609) 918-8017. Select fan participants will also get to announce the artists live via Google Plus Hangout. The hour will be hosted by "Weird Al" Yankovic and feature a set by Portugal the Man.

During the third and final hour, an entire set from a surprise previous Bonnaroo artist will be shown. Bonnaroo 2013 takes place June 13th through 16th in Manchester, Tennessee.