A quick one-two of Headlong into the Abyss and Chapel Song — about nihilism and jilted love, respectively — announce the night’s predominant themes: anguished lyrics, full-throated vocals and hell-for-leather backing. Juarez saw McCarthy come face-to-face with his demons (“got a drunk for a mother, got a saint for a brother”), while his three band mates — on drums, bass and trombone — sounded like a mini Arcade Fire.