Mission of Burma — worldwide standard bearers of the jarring, dissonant post-punk genre for generations — has gone on to a steady second run that has lasted far longer than its storied early years. Burma has released three dense albums already, and its fourth, “Unsound,” is being released next Tuesday. The group escaped the realm of “comeback story” long ago, morphing now into something even weirder — a grown-up, modern fable of how to be a band.
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