Named “Best Breakout” at 2014’s Bonnaroo by Rolling Stone, the hot Ukrainian folk-punk quartet creates a bright, unforgettable sound ranging from primal and propulsive to stirring and soulful. Mesmerizing vocals are accompanied by transnational instrumentation—everything from cello and accordion to didgeridoo, piano and percussion implements—in a melding of traditional Ukrainian folk music, African grooves, Eastern colors, and a contemporary sensibility the band calls “ethno-chaos.” Without a doubt, the most unusual and exhilarating musical event of the season.