The upcoming season of Game of Thrones has taken a turn for the ethereal. Entertainment Weekly is reporting today that Icelandic post-rock group Sigur Rós will appear in the fourth season of HBO's hit fantasy series, which is scheduled to air in spring 2014. According to EW, band members Jón Þór "Jónsi" Birgisson, Georg Hólm, and Orri Páll Dýrason are currently shooting on location in Croatia, though it remains unclear what role (or music) they'll play in the upcoming season.

The decision isn't a huge surprise, considering that Game of Thrones showrunners David Benioff and Dan Weiss are fans of the band's music — which they listened to extensively while shooting in Iceland — and the show's history of casting musical acts. Members of Snow Patrol and Coldplay have made guest appearances in earlier seasons, and HBO tapped indie band The Hold Steady to arrange a Westeros tavern song that played over the closing credits of an episode last season.