As we await for further announcements about the premiere date of the "Game of Thrones" season 4, we have a juicy spoiler about cast additions for your favorite fantasy show.

Entertainment Weekly reported that Icelandic band Sigur Rós will appear on the HBO hit series' upcoming season.

Band members Jónsi, Georg Hólm, and Orri Páll Dýrason are already on the set of the show, currently filming in Croatia.

Apparently the "Game of Throne" creators David Benioff and Dan Weiss are huge fans of the band and would even listen to their albums while the show was shooting scenes in Iceland.

Even though EW did not reveal the roles that the band will be playing, they did hint that seeing as they are musicians they are likely to play a role of that familiarity.

This isn't the first time the series has tapped musicians to appear on the popular show. Will Champion, the drummer from Coldplay made a cameo in season 3 as a drummer, meanwhile Snow Patrol's lead singer Gary Lightbody also had a small role on the show as well.

According to Wetpaint, another character set to appear in season 4 is the Red Viper, Oberyn Martell (Pedro Pascal). Not only is he one of the most popular characters in the book series but his fight with the Mountain is one of the most-anticipated scenes this season.

Also making an appearance will be Ellaria Sand (Indira Varma). While her presence may not be as exciting as the Red Viper, she and Oberyn have a very interesting relationship that we are curious to see play out on-screen.

Finally the character Styr, Magnar of Thenn is confirmed for season 4, however, the actor who will take on the role has yet to be announced.

Are you familiar with the Iceland band Sigur Rós? What is your opinion of their addition to the cast?

"Game of Thrones" season 4 is expected to return to HBO in early 2014, will you be watching?