If the early work of Icelandic post-rock band Sigur Ros approximated the sound of glaciers slowly melting (as good a description as any for music so beautiful), this record is the resonance of happy humans playing in the puddles left behind. Where Sigur Ros’ first couple albums were challenging in their ambience and intensity, their fifth studio effort is, at least in parts, warm, lush and inviting — as close to pop as these four guys may ever get. Translated from Icelandic, the album’s name means “With Buzzing In Our Ears We Play Endlessly.” This band, considered inscrutable by some, could not have picked a more plainly perfect title.