Metallica were joined by Diamond Head guitarist Brian Tatler for a cover of the latter band’s classic “Am I Evil?” during Metallica’s headlining set at the Tons of Rock fest in Oslo, Norway, on Wednesday (June 26th).

It marked the first time Metallica have performed “Am I Evil?” on the “M72 Tour” (get tickets here) thus far, and the band made the most of the occasion by inviting one of the original songwriters onstage for the rendition.

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“Say ‘Hi’ to Brian, Oslo!” announced frontman James Hetfield over the Pa before declaring it “Flying V time,” in reference to Tatler’s axe of choice.

The founding Diamond Head guitarist got dibs on the iconic opening tritone riff while Hetfield and Kirk Hammett laid down the propulsive rhythmic chugs. They eventually all synchronized to form a triple guitar attack, guiding the nearly nine-minute song to its epic conclusion.