Jimz S is a Greek metal musician whose releases including Shadows From The Past deliver heavy compositions rooted in the Greek metal tradition. His solo work channels the intensity of Hellenic metal through dark, aggressive guitar-driven compositions.

Joda Cema is a death/groove/thrash metal band from Bournemouth, UK, who have been taking the bullshit out of metal since 2004. Their humorously titled album David Hasselhoff's Top 50 Power Ballads (2016) belies the serious heaviness of their death and thrash metal compositions.

John Doe is a heavy metal band from Poland that creates aggressive, anonymity-themed heavy compositions. Their work channels the spirit of the Polish underground metal scene through hard-hitting riffs and intense performances.

Johnny Mental is a metal and thrash metal musician from Wales active since at least 2003, with releases spanning over a decade of heavy compositions. His albums including The Fire In Which The Heart Resides (2004) and Pining For The Fjords deliver aggressive Welsh metal with a distinctly independent spirit.

Jony Walker is a Polish metal musician whose heavy compositions span multiple subgenres within the broad metal spectrum. His work contributes to Poland's vibrant heavy music underground with energetic, riff-driven compositions.

Josh Keech is a guitarist, musician, and YouTuber from Bedford, UK, whose debut solo project Warrior In The Clouds showcases his diverse metal influences across two parts. His instrumental guitar work spans multiple heavy styles, reflecting his background as a content creator and performer.

Joshua Dalviken is a solo symphonic and melodic death metal artist from England who composes, performs, records, and masters his work entirely alone. His album Overlord (2021, remastered 2023) features eight tracks of sweeping orchestral metal blending power, doom, and death metal elements across a 42-minute runtime.

Joao Miguel is a Portuguese guitarist and composer from Almada who creates instrumental progressive metal and math rock. His album STONESUN (2018) and EP Geometric Winters (2015) showcase technical guitar proficiency and compositional complexity, blending clean shred with progressive and thrash metal influences.

Judge Minos is a heavy metal band from Wallisellen, Switzerland, formed in 2017 and featuring clean to high-pitched vocals paired with mighty guitar riffs. Their debut album The Keeper Of Imbalance (2020) was produced at Valhalla Sound Studio and has been praised as a must-listen for fans of traditional heavy metal with a modern approach.