The Sword opening up for Lamb of God and Metallica. Been a fan of The Sword ever since.
I've seen In This Moment open twice (one for Megadeth, and one for Rob Zombie and Ozzy) and both times they were fantastic.
Trivium opened for Dream Theater, and say what you want, but Trivium can ****ing perform.
Steel Panther opened for Judas Priest. First time I'd ever heard of them and they were amazing.
In Flames were the first to perform at Mayhem Fest and they were really good.
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