Saw Mastodon and Converge last night. Converge was simply amazing, during songs Jacob Bannon was all over the place and screaming his face off, while in between he was incredibly gracious to the crowd and did a cool little intro to each of the songs. As a supporting band, their set wasn't as long as I would've liked, but oh well...they closed with Concubine, which was heavy as fuck.
Mastodon played Crack the Skye in its entirety, which was fucking awesome. I don't know what it was, but they started out a little shaky with Oblivion--I think it's just not a great live song. But by The Last Baron they looked as excited to be up there as the crowd was to be there, and then they came back out to play some stuff from earlier albums, which was epic. Overall GREAT performance from Mastodon.
Dethklok was also headlining...it was interesting, they had a live band performing the songs with videos for each song on the screen behind them. I didn't really take them seriously but a lot of people looked like they had actually come to see Dethklok...they do have real talent, with Gene Hoglan on drums and Metalocalypse-creator/guitarist/vocalist/Berklee-grad Brendon Small absolutely tearing it up. But yeah, music obviously wasn't THAT great, but they still put on a good show.
Go see this tour if you can.