Jón þor (Jónsi) Birgisson is an Icelandic musician, best known as singer and guitarist of Sigur Rós, a band he co-founded as a teenager. With Sigur Rós he has released seven albums, which have taken the band on a journey from obscurity to a position as one of the biggest 'underground' bands on the planet.  

As a solo artist, Birgisson has released 'Go'; his first collection of songs under the name Jónsi, which enhanced his reputation for stunning live representation; and 'Riceboy Sleeps', a collaborative ambient record with his partner Alex Somers, with whom he also stages exhibitions of drawings and paintings. As a film composer Birgisson first work was to write the end title song to 'How To Train You Dragon', followed by the score for Cameron Crowe's 'We Bought A Zoo', and more recently worked on the soundtrack for 'How To Train Your Dragon 2'.

In 2020, Jónsi returned with his first solo work in over a decade - 'Exhale'.