Footage of actor Joseph Quinn practicing Metallica’s “Master Of Puppets” for “Stranger Things” has surfaced online. You can check that out below. An updated version of the aforementioned track with “additional guitar tracks” from Robert Trujillo’s 17-year-old son Tye Trujillo (OTTTO) is featured in the season four finale of the show during a scene in which Quinn’s character, Eddie Munson, is playing guitar inside the “Upside Down.” Footage of that is available below as well.