The members of Metallica have dropped a video of "Master of Puppets" taken from their June 28 concert in Cardiff, Wales. The band ripped through the 1986 track at Principality Stadium as part of the M72 World Tour. The title track from their third album popped up on the setlist during the Cardiff performance. Master of Puppets, the album, made history as thrash metal's first platinum record back in 1986. It's the heaviest rock album ever chosen for being "culturally, historically, or aesthetically significant."