Silje Nes’ bewitching songs are a perfect byproduct of these musically fractious times (how many sub-genre labels are there now for electronic music alone?). With every kind of music at our fingertips these days, one might assume Nes’ creative expressions are nurtured on the intake and filtering of far-flung genres and ideas: classical forms bump up against arty noise, hazy soundscapes flutter and fade into a pulse of sound, seconds before morphing into pop neon. The formally trained Norwegian musician is a playful and assured composer, and a curious experimenter. Much like the music of Sigur Rós and Jónsi, Opticks has a magical, transportive quality, and when her crystalline guitars on “Glass Harp” get swept up in the sounds of the ocean, and later in a wash of static, or her Kraftwerkian synth burbles on “Levitation” sound like they want to bust into a rumba, it’s a pleasant sensation more than a surprise. This is Nes’ second full-length release, and expecting the unexpected from her music is part of the listening experience.