Since forming in 1995, Agalloch has put out just four full-length albums (with a handful of EPs sprinkled in between), and yet, while such a sporadic release schedule (and equally sporadic touring routine) might be seen as a detriment to a band’s career, it has had the opposite effect on this Portland outfit. Led by John Haughm (and now featuring San Francisco drummer Aesop Dekker, formerly of Ludicra and currently also of Worm Ouroboros), Agalloch plays contemplative, cinematic “folkish” black metal with progressive elements. It’s far more thoughtful than 99.99 percent of metal these days, and is crafted with equal attention to melody and heaviness — which explains why NPR covers it and fans obsess over it. The band is still supporting last year’s twenty-minute-plus single-song EP, Faustian Echoes, and will stop by the Oakland Metro (630 3rd St.) this week as part of a brief, four-stop West Coast tour. It’s a rare opportunity, so don’t miss it. With Worm Ouroboros and Lycus.