The heavy metal band geeked out over the inclusion of the song in the season 4 finale.

Warning: This article contains spoilers forStranger Thingsseason 4.

How crazy cool is that?

STRANGER THINGS

Joseph Quinn as Eddie Munson in ‘Stranger Things 4’.Tina Rowden/Netflix

“We had a backing track and I was playing along with it,” Quinn said.

It’s a pretty adolescent fantasy to be a rockstar, isn’t it?

I felt like one for a night.

It was great having Gaten up there with me.

They really turned it up when they played ‘Master of Puppets’ and the whole crew were there."

Quinn said it felt like a celebration despite his character’slooming fate.

“So it felt like a real celebration.”

EW’sUltimate Guide to Stranger Thingsisavailable onlineor wherever magazines are sold.