Best live performance of any band you've seen.
 

In Flames

These guys are absolutely without a doubt the best live show I've seen time and again without fail. Their live sound is as good as their studio quality, but better because of the bass thumping in your ribs, crowd environment, etc.

Some bands have come close to being this awesome, but they take the lead for me personally.

Slightly Stoopid is simply amazing.

local natives with the LA philharmonic orchestra

my favorite band right now. the show was amazing, the video does no justice though because you can't hear the orchestra really.

In flames is good, seen them about 6 times live. My personal 2 most exciting/best live performances of all time have to be Megadeth (the crowd is so intense for them, unlike anything i've ever seen) and Iron Maiden (Just because their stage show is unmatched) ...number 3 would be the misfits...well just because they're sick

Children of Bodom rocked my face off. Consequences will never be the same.

I just saw Megadeth last night, but because it was on the main stage it wasn't as amazing as it could of been.

There is no place for chairs or seats in metal, ever.

If I saw them up close and personal, I probably would have been in heaven.

Best stage show, by far, was Alice Cooper. In terms of best musical performance it's a toss up between Slayer and Blind Guardian.

Pearl Jam live.

Pantera

Always wanted to see Coheed live

http://www.youtube.com/watch?v=OxowWo_XV_c