Jón Þór "Jónsi" Birgisson is an Icelandic musician; he is the vocalist and multi-instrumentalist for the Icelandic post-rock band Sigur Rós. He is known for his use of a cello bow on guitar and his falsetto or countertenor voice.
Jónsi released his debut solo album Go on 5 April 2010. A decade would pass before Jónsi would release his second studio album, Shiver, which was released on 2 October 2020. He would release his third album Obsidian a year later in conjunction with the exhibit of the same name. He has also collaborated with his ex-partner Alex Somers and has contributed to the scores for the films How to Train Your Dragon and We Bought a Zoo.