Philadelphia stoner/doom outfit Mothman and the Thunderbirds mine American cryptid mythology for atmosphere, wrapping their heavy riffs in an occult Appalachian mystique that feels right at home in the city's heavy music scene. Formed in 2020, the band traffics in slow, smoky heaviness with a taste for the strange.

Philadelphia stoner/doom band Mountain High embrace the fuzzed-out, slow-burning side of heavy music, delivering riff-heavy material that prizes groove and heft over velocity. Formed in 2013, they are part of a deep-rooted Philly heavy tradition that has long favored the low and slow.

Bucks County, Pennsylvania's Mountain Shadow are a newly formed (2024) project spanning an unusually wide stylistic range — atmospheric black metal, folk metal, death metal, doom, and death-doom — suggesting a band intent on using the full palette of extreme metal rather than settling into a single lane. The project's scope and ambition make it one of the more intriguing recent arrivals in the Pennsylvania underground.

Lancaster, Pennsylvania's Mule Thrower arrived in 2021 with a sludge-doom sound as stubborn and heavy as their name implies — slow, punishing, and built on the kind of oppressive riffing that demands physical submission.

Pittsburgh death/doom outfit Mythic deal in the slow, suffocating end of the spectrum, dragging crushing riffs through a fog of morbid atmosphere. Formed in 2015, the band pairs the deliberate heaviness of doom with death metal's guttural aggression.