Each passing year seems to bring more hand-wringing over the so-called "EDM bubble." Whether or not the shiny, mainstream, pop-dance sphere is set to burst, electronic music, as it always does, continues to rave on. This year's best albums prove the ostensible underground's in tip-top health, with dance fans ready for a darker and headier bent, from challenging young artists like Nicolas Jaar and Arca to weirdo vets like Autechre and Aphex Twin. On the other end of the spectrum, mainstream standouts like Kygo, Flume and Eric Prydz continued to make stellar album statements in an environment of singles and Soundclouds. In between, slinky R&B, downtempo and outré techno helped out another bumper crop of the year's best.