An unexpected star has emerged from HBO’s new science fiction Western "Westworld": The player piano.

The old-timey instrument, which plays music on its own, is featured in the show performing contemporary rock hits like Soundgarden's "Black Hole Sun" and Radiohead’s “No Surprises.” The tunes were transcribed into piano music by the show’s music composer Ramin Djawadi, who is also known for scoring HBO’s other big genre show, “Game of Thrones." But the instrument is much more than just a vehicle for kitschy arrangements.

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