On this special edition of All Songs Considered, Bob Boilen speaks with Jónsi, from the Icelandic band Sigur Rós, about ÁTTA, that group's first studio album in more than 10 years. Coming out 26 years after they released their first album, ÁTTA is music the group made over years, first in informal reunions in Jónsi's basement before and during the COVID pandemic, and eventually in collaboration with the London Contemporary Orchestra. The unmistakable singer talks about how it felt to have the band playing together again after a decade and reveals some of the meaning behind the first single from the album.