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Icelandic rockers Sigur Rós are continuing the tradition of rockers popping up on "Game of Thrones." 

"Entertainment Weekly" says the trio is currently in Croatia shooting an appearance on the award-winning HBO series. 

The exact nature of the band's cameo is being kept under wraps, but it's rumored to have some sort of musical element. 

"Game of Thrones" has previously featured guest spots from members of Coldplay and Snow Patrol, while the National and the Hold Steady have made contributions to the show's soundtracks. 

Season four of "Game of Thrones" is set to premiere next spring. 

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