Metallica just released this on their official YouTube channel. This was taken from their appearance at the 1985 Metal Hammer Festival, which they headlined (one of their first headlining gigs as a touring act). This gig is noteworthy for having 3 songs from that show (The Four Horsemen, Fade to Black, and Seek and Destroy) featured on the band's home video debut, Cliff 'em All (which was released in 1987 as a tribute to their fallen bassist Cliff Burton, who was killed in a tour bus accident on September 27th the previous year).