Machine Head frontman Robb Flynn has posted a new "diary entry" on the band's official web site:

"Metallica at Wembley Stadium [in London in early July]. Duuuuuude!? DUUUUDE!?!?!? Such an honor. Handpicked. Last minute.

"To be honest, we thought it might be a bit rough just because we were thrown on so late in the game, our fans might not know about it in time, etc. But oh my god, dude.

"Let me preface this and start by saying that, straight up, the first three songs were literally the sloppiest we'd played on the entire 'Blackening' run. Jesus?! Guitar cutting out, broken strings, tech hands me my guitar wildly out of tune, Phil's [Demmel] wireless goes out... it was like, NOW?! Were gonna have all these problems NOW??!! Christ al-fuckin'-mighty! But you know what...it didn't matter, the crowd went friggin' APESHIT! The circle pit for 'Imperium' (which Monte Conner says is the new 'Davidian') was... just... oh my fuckin' GOD! We FINALLY pulled it together for 'Halo' and 'Davidian', and from 'Halo' on...the world just fell into place...everything got easy. Didn't know it at the time but [James] Hetfield watched us... from 'Halo' on... whew!

"Mastodon ruled, as always. But Metallica, man, Metallica... dude... untouchable that night. I've seen a couple bad shows from them recently, but man, they walked on fucking water that night. What a vibe. Setlist: impeccable. Between-song banter: hysterical. The crowd sing-a-long to the 'la-da-da-da' part, from the lone post-'Black'-album song they played ('Memory Remains')... it went on for two minutes after the song ended... goose-bumps man... fucking... goose-bumps.

"Hetfield hung in the dressing room, told us he's rockin' to 'The Blackening'. 'There's some epic shit on there.'... My brain pretty much imploded at that point... smoke out of the ears and everything... full-on frizzle fry.