Ramin Djawadi's poignant composition "Goodbye Brother" is used throughout the 8 seasons of Game of Thrones. It's considered the theme of House Stark.
The sparse melody mirrors the emotional turmoil of the Stark siblings as they part ways. "Goodbye Brother" serves not only as a musical backdrop to a pivotal moment in the series -- but also as a reminder of the Stark's enduring familial bonds.