On soundtrack for season 2 it is the first time that we can hear the theme song for House Greyjoy (track 3). It is named "What Is Dead May Never Die" because on the Iron Islands over which the Greyjoys ruled the main deity was the Drowned God.
Игра престолов: Сезон 1 / Game of Thrones: Season 1
An interesing fact about the main theme and most of this show's music is that they wanted to avoid using flute and vocals in order to make it more distinct from other fantasy shows. This is why you can hear so much cello here instead.
This soundtrack is wonderful, each track has something magical to it. You can hear that the composer put so much love into this. He even used Dragon Language from the lore for one of the tracks ("Dragonborn" from CD 1)!