I'm gonna have to say that Mastodon are actually my favourite band.
I've seen them live once, when they were supporting Slayer, I went to that damn expensive gig just to see them.
Thing is, due to "overwhelming demand" (ie. the gig sold out before the first day was through) it got moved to another venue and it became all ages and such. Bad part, the venue they moved it to is a pile of shit, it's practically just a tin shed. It was irritating also with the all ages crowd who don't know how to get a good mosh going, one that looks out for everyone and the such, no they all wanted to jump up and down on the same fucking spot, who cares who they hit with their elbows, even if it were chicks. Pissed me off, and the sound quality wasn't great, but I still loved being able to see them in the flesh doing their thing.
Just brings about my hatred for the typical Slayer fans though, there would be a break in the songs and they'd just be chanting Slayer or whatever. I'm really not a fan of Slayer, I can appreciate what they've done for metal, but to put it plainly, all their shit sounds the same and I find it fucking boring. Oh, not to mention hypocritical as fuck.
Oh well, I'm just hoping that Mastodon come back again, I'm waiting with baited breath for their next album.