A musician ​is an unnamed minor character in the fourth season. He is played by guest star Jón Þór Birgisson and only appears in "The Lion and the Rose". Jón Þór Birgisson is currently a member of the Icelandic post-rock band sigur rós which do a cover of "The Rains of Castamere" for the closing credits of the episode "The Lion and the Rose".