“God is dead,” Mikael Åkerfeldt declares reassuringly near the top of Heritage, the latest from Sweden’s Opeth. That’s the kind of proclamation that provides a through line in Opeth’s catalog, which veers from growly death metal to ’70s-style hard rock to beautiful, flute-assisted Scandinavian folk. Expect to hear it all tonight.

Wed., Sept. 21, 6 p.m.; Thu., Sept. 22, 6 p.m., 2011

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