An Icelandic musician and composer, he is best known as the lead vocalist and guitarist for the post-rock band Sigur Rós. Renowned for his ethereal falsetto and use of a bowed guitar, he has significantly influenced the band's atmospheric sound. Outside of Sigur Rós, he has pursued solo projects, including the album "Go," showcasing his talent for blending lush orchestral arrangements with minimalist electronic elements. His work often reflects themes of nature and emotion, resonating with a global audience.