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For someone whose voice could be described as a comatose croon, Matt Berninger is an astonishingly expressive singer. As the frontman and songwriter for the National, he conveys a lot of emotion in his laconic delivery, which creates a nervous tension in the music. “Trouble Will Find Me” is the Brooklyn indie-rock band’s sixth and most deft album yet, a haunted and lugubrious meditation on loss and despair. It follows 2010’s “High Violet,” which marked a critical and commercial peak for the National, and it builds on that album’s momentum by letting some light and space into the group’s sound.