Jaded Star is a symphonic/progressive metal band from Athens, Greece, founded by Maxi Nil, formerly of Visions of Atlantis. Their albums Memories From The Future (2015), mixed by Fredrik Nordstrom at Fredman Studios, and Realign (2020) have earned them European tour slots alongside Epica, Moonspell, and Delain.

Jadira is a metal band from Tallinn, Estonia, whose releases including Desires and The Mason showcase their approach to heavy music from the Baltic underground. The Estonian metal scene's unique character infuses their compositions with a cold, atmospheric quality distinct from their Scandinavian neighbors.

Jaern is a doom metal band from Gothenburg, Sweden, established in 2019 and featuring a four-piece lineup including guitarist/vocalist Marko Brostrom. Their self-titled debut EP (2020) delivers four tracks of fuzzy, heavy doom with psychedelic and sludge elements, with the track Miasma earning particular praise from the Swedish underground doom community.

Jagannah was an experimental comedy/psychedelic doom band from Modena, Italy, active from 2006 to 2011 and self-described as having come from space, played for space, and gone to space. Their album Aneha Hi How (2017) features nine tracks blending Melvins-influenced doom with surreal humor and absurdist performance.

Jagannath is a metal band from the Netherlands that channels heavy, aggressive compositions through a modern European lens. Their approach to the genre blends multiple metal subgenres into a crushing, dynamic sound within the Dutch metal underground.

Jagannatha is an instrumental doom and stoner rock trio from Grenoble, France, creating extended psychedelic compositions since their 2016 debut. Their three albums culminating in Trimurti (2022) have earned devoted fans with meditative, heavy psychedelic jams that blend crushing doom with spacey exploration.

Jagged Vision is a metallic hardcore band from Oslo, Norway, whose album Death Is This World (2017) was recorded by Phillip Cope at Jam Room Recording Studio and mastered by Brad Boatright at Audiosiege. Their crushing sound draws comparisons to Kylesa, early Mastodon, and High On Fire, delivering hardcore sludge with inventive riffs.

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.

Jaggu is a heavy sludge and stoner metal band from Oslo, Norway, with four albums from Revenantian (2019) through SLUGGU (2023) recorded at Red Line Studio. Their sound blends metal, sludge, and stoner rock with guest contributions from musicians like Babs Johnson of Shaving The Werewolf.