The ethereal and eerie, sonic landscapes of the Icelandic avant-garde rock band Sigur Rós transcend language—and only partly on account of lyrics that are sung in both their native tongue and an unintelligible, invented one that’s been called “Hopelandic.” Frontman Jón Þór “Jónsi” Birgisson morphs and bends his folkloric falsetto like an ambient drone, chartering an otherworldly sound that first garnered global acclaim in the early aughts. In the years following, the vocalist and multi-instrumentalist has collaborated with a myriad of artists, including Doug Aitken, Olafur Eliasson, and Merce Cunningham, across many mediums.