Little Dragon is exactly the kind of group to play at Lightning in a Bottle during its transition period. They are not DJs and they are not laptop electronic noodlers. But this Swedish band uses the sounds of Electronic Dance Music, or EDM, as one color among many on their palette, and they incorporate just as much hip hop as they do jazz, R&B, glitch, rock, and ’80s textures. With singer Yukimi Nagano’s soulful voice the common thread through all of Little Dragon’s discography, the band has constantly evolved over its four albums, culminating in the dark tones of this year’s “Nabuma Rubberband.”