Glitter showered the crowd at August's all-night Sonicmania event as electronic artist Zedd cued up his hit song, "Stay the Night." The crowd bobbed along at first, but as the track built and let loose in a whirlwind of bass and synthesizer the audience followed suit with fists pumping in the air and frantic jumping. Young, neon-clad and a bit boozy, this is Japan's EDM generation.