You've heard it belted from the electronics guts of a Commodore 64. Now you can experience it more organically with the help of Peter Hollens and Lindsey Stirling — vocalist and violinist respectively. Something as epic as the Game of Thrones theme would be a massive task for two people, yet these guys do a magnificent job of it.
As Blastr writes, Hollens and Stirling layer their performances to create a fuller, more vibrant piece, with 140 individual tracks making up its content. The accompanying video is a nice touch — who doesn't like fishing chess pieces out of the desert? — but you don't have to watch it repeatedly if all you want is the music. It's available for less than $2 from iTunes, or if Apple's music store isn't your thing, a place called the "Cover Song Store".