Warning: Mild spoilers follow for the most recent episode of Westworld‘s second season, “The Riddle of the Sphinx.”

Westworld composer Ramin Djawadi doesn’t only create music and incredibly catchy and memorable covers for the HBO series, he shows up in a cameo role. In Sunday’s episode, “The Riddle of the Sphinx,” the Man in Black returned to Pariah and ran into Major Craddock and the other Confederados Teddy was supposed to execute. The soldiers harass the MIB and the townspeople, including one familiar-looking host playing guitar:

The hat and beard make him difficult to spot, but HBO confirmed to Nerdist that the guitar player is indeed Djawadi. He appears just after Craddock roughs up Lawrence; he sneers at Djawadi’s host and tells him to, “Keep fucking playing.” That’s the kind of guy Craddock is.

You can hear Djawadi, known for his work on shows such as Game of Thrones and films like Pacific Rim, in every episode. He’s responsible for this hard-to-stop-listening-to version of Nirvana’s “Heart-Shaped Box:”

And this inventive spin on The White Stripes’ “Seven Nation Army” that played during the show’s first visit to The Raj, the Indian-inspired world.

Djawadi’s work on Westworld‘s theme can’t be overlooked, nor can his many haunting and emotional pieces for the show.

Which cover in Westworld has been your favorite so far? Tell us in the comments.

Images: HBO

Amy Ratcliffe is a Managing Editor for Nerdist. Maybe she’s a host. Follow her on Twitter.

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