These guys are a cello rock band, which is something relatively new to me. I’ve heard a lot of bands incorporate heavy use of both the cello and the violin, but had no idea it was a genre onto itself.
Cello rock and cello metal are subgenres of rock music characterized by the use of cellos (as well as other bowed string instruments such as the violin and viola) as primary instruments, alongside or in place of more traditional rock instruments such as electric guitars, electric bass guitar, and drum set.
Cellos, often in groups of three or more, are used to create a sound, rhythm, and texture similar to that of familiar rock music, but distinctly reshaped by the unique timbres and more traditional genres of the cello (in particular) and other string instruments used. The cellos and other stringed instruments are often amplified and/or modified electronically, and often played in a manner imitative of the sound of electric guitars. They are often combined with other elements typical of rock music such as rock-style vocals and drumming.
Game of Thrones theme song arranged and performed by cello rock band Break of Reality. Original composition and soundtrack by Ramin Djawadi.