Two decades is a long time to be at it, considering we now live in an instantly disposable era.

Even more impressive are the various trends Sigur Rós has watched come and go since forming in Reykjavík back in 1994: grunge, pop-punk, rap-rock, nü-metal, dubstep, rawk, indie-pop, beachwave, and, well, we could go on. There’s a reason for the band’s longevity. When Sigur Rós broke with 1999’s Ágætis byrjun, much of the fanfare revolved around the group being impossible to classify. Was it best filed under sinfully beautiful chamber pop, ornate postrock, or new-millennium prog? That question has remained impossible to answer. The best thing about Sigur Rós’ appearance at the Queen Elizabeth Theatre on Sunday (September 18)? Well, with two decades of recordings to choose from, there will be no padding the set. Also, no nü-metal, rawk, or dubstep.