Arbor Vitae explores progressive metal from the coastal city of Vaasa since 2020, their Latin name meaning "tree of life" reflecting organic, growth-oriented compositions. Their sound channels the natural world through the lens of progressive metal's technical ambitions.

Born from the members of Noxius Corp., Arborea crafted progressive gothic metal in Barcelona before releasing their sole album "Collage" in 2012 and disbanding. Their brief but focused career captured the melancholic beauty of Catalonia's gothic metal scene at its most introspective.

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Arborectum fuses black and death metal from the Pohjanmaa region since 2023, their botanical name suggesting a cultivated approach to extreme metal. The project draws from Ostrobothnia's flat, forested landscape to create music of vast scope.

Arboretum delivers death metal from Norwich since 2015, their botanical-garden name creating an organic contrast with the brutality of their sound. Over a decade of East Anglian extremity speaks to the Norfolk city's active metal scene.

Arbour crafts gothic doom and death metal from Ålesund on Norway's Art Nouveau coast since 2014. Their garden-shelter name evokes the sheltered, verdant spaces where beauty and decay coexist — much like their music.

Arbre channels black metal from the French underground since 2012, their name simply meaning "tree" in French, connecting their music to the ancient forests that inspire so much of the genre. Their naturalistic approach draws from the roots of black metal's environmental mysticism.

Arbulubra are a Swiss avant-garde black metal collective whose discography — spanning "MMXIX," "II," "III," "Of Blackness and Calm," and "Overgrown" — moves fluidly between blistering raw black metal and striking atmospheric passages incorporating banjo, mandolin, and synthesizer. Released through Anthrazit Records and affiliated with the Unda Obskura project, the band stands among the most adventurous acts in the Swiss underground.

Arcade Messiah builds progressive and post-metal from the northwest Irish town of Sligo, where they have operated since 2014. Their sound captures the dramatic landscape of Yeats Country through expansive, cinematic compositions that blend heaviness with atmospheric grandeur.