Been a fan of this youtuber's music for a while now. Channel is called Karliene.
Not sure if i posted her songs before but i may have. She does original & covers from various fantasy/history series Vikings, LOTR, GOT, Arthurian legend, Celtic legends Boudica etc...She even does a few covers of some of Tolkien's songs from the books. 'Lament for Boromir' is a beautiful cover
Spoiler warning as its a song from GOT no real spoilers in the song, but i know how feral people can get over such things.