The sound is Dolby Digital but is 2 channel stereo, NoT 5.1 (I assume these songs are as originally recorded for CD). Like most music video on DVD, this is rerecorded pre 5.1 material. I can't wait for Bjork and her director friends to catch up with the audio state-of-the-art. This is the best I have seen because 1)the visual productions are stunning and 2)even though Bjork is the screen-hogging self-obsessed star of each song-story, she's expressive and beautiful.