Conversation so far:
who sings rains of castamere on game of thrones?
The Rains of Castamere is by the indie rock band The National and sung by their vocalist Matt Berninger.
who is the producer of song The Rains of Castamere from Game of Thrones?
Ramin Djawadi

Question: who wrote the song?
Self-contained rewrite: who wrote the song The Rains of Castamere from Game of Thrones?