It's official: "Game of Thrones" Season 6 is going to be just as rockin' as its predecessors.

Entertainment Weekly has confirmed that members of the folk rock band Of Monsters and Men will appear on the show's new season -- likely for a cameo role -- after they were spotted in a few set photos from production in Spain.

The Icelandic band's lead singer-guitarist, Nanna Bryndís Hilmarsdóttir, and drummer, Arnar Rósenkranz Hilmarsson, were seen standing in costume at the Sant Pere de Galligants monastery filming location in Girona -- which is largely expected to be serving as the locale for Oldtown, the former hometown of Sam Tarly and his family.

The band, which has admitted to being "obsessed" with the show, joins a growing list of major rockstar cameos the show has hosted over the years. And, if they're anything like their predecessors in interest here, they'll probably be bringing some tunes into play.

Gary Lightbody

Snow Patrol's lead singer was one of the dudes who kidnapped Brienne of Tarth and Jamie Lannister in Season 3. And of course he sang.

Will Champion

The Coldplay drummer had a split-second jam sesh in Season 3's penultimate episode... just before all the Red Wedding sh-t hit the fan.

Sigur Rós

The band offered up some instrumental entertainment for King Joffrey's wedding in Season 4, but the tyrant's reaction was as obnoxious as ever. Talk about your tough crowd.

Mastodon

The heavy metal rockers channeled their inner White Walker-ness for a violent Season 5 cameo. And though they were taking up arms instead of instruments during their scene, they did contribute the song "White Walker" to HBO's "Game of Thrones" companion mixtape Catch the Throne Vol. 2.