Drone metal is the slowest end of the entire metal spectrum. A typical track contains fewer note changes in twenty minutes than a thrash song contains in twenty seconds. The point is the sustain, the feedback decay, the way a single chord sounds when it is allowed to bloom for a minute and then taken away.
What defines it
Tempos approach motionlessness. Guitars are usually tuned far below standard, often in the C or B range or lower, and held in long sustained chords with heavy distortion and amplifier feedback. Drums, when present at all, mark glacial pulses rather than time signatures. Vocals are sparse or absent; when present, they tend towards chanted, whispered or guttural lows. Compositions favour slow textural change over development.
The American template
Seattle’s Earth, fronted by Dylan Carlson, is generally credited with the first proper drone metal records — Earth 2: Special Low-Frequency Version (1993) is the most-cited foundational text. Sunn O))) (the name visually represents a Sunn amplifier logo) built directly on that template in the late 1990s and became the genre’s most internationally visible act, partly through their highly theatrical live performances involving robes, fog and brutal volume. Khanate added vocal extremity. The American scene defined the surface of the genre.
The Japanese parallel
Boris, formed in Tokyo in 1992, ran a parallel track. Their output ranges far wider than drone metal alone — they have made rock, sludge, ambient, J-pop-adjacent material — but their slow records sit firmly within the genre and have been deeply influential, particularly Absolutego (1996) and the collaborative Altar with Sunn O))) in 2006. Other Japanese acts including Corrupted have extended the lineage.
Why it sits apart
Drone metal asks more of its listeners than most metal. The reward is a different kind of heaviness, one that operates on the body more than on the brain. The genre has a small but devoted audience and minimal crossover into adjacent metal scenes.