In an early July interview with Entertainment Tonight, "Stranger Things 4" actor Joseph Quinn confirms that it is indeed him shredding away at Metallica's "Master of Puppets" for real onscreen (via YouTube). "It's pretty much all of me," he confirmed. The actor added that he has a background in music and has played the guitar since he was young, which made it a little bit easier for him to step into Eddie's shoes and play along. "I had kind of the foundations to take most of it. It's great fun, you know, who wouldn't wanna kind of be a rock star for an afternoon or an evening?"
While the actor has mainly specialized in period pieces before playing the very American Eddie — he's perhaps otherwise best known for his work as Prince Paul in HBO's "Catherine the Great" or Enjolras in the 2019 version of "Les Misérables," per IMDb – his playing was impressive enough to draw accolades from the band itself. "It's so extremely well done, so much so that some folks were able to guess the song just by seeing a few seconds of Joseph Quinn's hands in the trailer!! How crazy cool is that?" a post published on Metallica's official Instagram reads in part.