Sigur Rós are definitely one of those bands that you just cannot predict. They'll spend nearly 15 years releasing (arguably) more and more accessible records, from the sparse electronics of 'Von' through to the summery sounds of 2008's 'Með suð í eyrum við spilum endalaust' and then fade away into suspected hiatus and then out of no where release a track like this.
Ekki Múkk is the first track to be take from the bands 6th album 'Valtari', released May 28th, and it is wonderful. A nearly 8 minute dark soundscape, through which Jonsi's distinctive vocals crack with their usual ethereal beauty. Over the course of their career they have varied their sound greatly but still carved out a sound that is obviously "them", and this track is no exception to the pattern. It points towards a record that will hold far less melody than their previous offering, but providing it maintains the level of magic this track holds it should be a comfortable contender for album of the year.