As a curator, writer, and authority on what’s cool, Finn Håkon Rødland is what you could call the leading expert on “True Black Metal.” He possesses the most important collection documenting the ...

For fans of extreme music, Mayhem released black metal’s defining album, “De Mysteriis Dom Sathanas,” in 1994. Everybody else might just vaguely remember lurid early ’90s tabloid headlines.