The experiment was a successful one, and the band has embarked on a fall U.S. tour to promote Na Na Ni, which is set to be released later this month.

NPR: Fredrik: 'Black Fur'

Though Na Na Ni does have a few relatively conventional pop tunes, like the lovely sing-along lullaby of the opener "Black Fur" and its successor "Alina's Place, " some of its most fascinating pieces are those that abandon traditional structures and vocals.

NPR: Fredrik: 'Black Fur'