IV Luna is a progressive rock/metal band from Rome, Italy, active since 1999 and crafting ambitious, technically proficient compositions that push beyond conventional metal boundaries. The project channels progressive sophistication.

Ivo Petrović is a progressive metal band from Pula, Croatia, active since 2017 and crafting ambitious, technically proficient compositions that push beyond conventional metal boundaries. The project channels progressive sophistication.

Izah is a atmospheric sludge/progressive metal/hardcore band from Tilburg, Netherlands, active since 2008 and delivering crushing, suffocating heaviness from the low end. The project channels the abrasive, punishing weight of sludge metal.

Izumi is a progressive metal band from Castelo Branco, Portugal, active since 2018 and crafting ambitious, technically proficient compositions that push beyond conventional metal boundaries. The project channels progressive sophistication.

Jackknife Seizure is a progressive metal band from London blending grunge, progressive, and hard rock influences into a distinctive heavy sound. Described as the love-child of Mastodon and The Doors, their albums Starfisher (2017) and Time of The Trilobites feature eccentric vocals, space-themed lyrics, and complex progressive riffs.

Jacobs Moor is a progressive power/thrash metal band from Vienna, Austria, formed in 2014. They have released several albums including Anthems For The Apocalypse and All That Starts, blending technical proficiency with aggressive thrash energy and progressive structures.

Jaggernaut is a heavy metal band from Sweden whose dark, aggressive compositions channel the intensity of the Swedish extreme metal tradition. Their extensive discography including Immortal and Distorted Heavens demonstrates a prolific approach to heavy, uncompromising metal.

Jakub Dukowski is a progressive heavy metal solo artist from Bytom, Poland, whose debut album Beginning Of The Road (2022) features eleven tracks of complex, extended metal compositions. His progressive approach to heavy metal incorporates intricate arrangements characteristic of the genre's most ambitious practitioners.

Janissary is a heavy metal band from Serbia named after the elite Ottoman military corps, delivering aggressive compositions with historical and martial themes. Their approach to metal draws on Eastern European traditions to create a distinctive, powerful sound within the Balkan metal scene.