Obsidian Key was formed in 2010 by the Italian multi-instrumentalist Sonic V while he was trying to put together some material for a solo album.

Obsidian Key's music is a combination of rock, heavy metal and progressive rock with strong influences from classical and symphonic music as well as influences from genres like pop,jazz, fusion, electronica and folk.

Obsidian Key's music is characterised by the use of traditional rock music instruments (guitars, bass guitar, drums, digital synthesizers, electric organ) mixed with instruments more common in classical music (e.g. piano, violins, violas, celli, horns, harps, flutes, classical guitars). Sonic writes the music and most of the lyrics, sings and plays all of the instruments on all of the Obsidian Key albums, alongside many guest musicians.

Compositions span from more technical orientated structures to more melodic and expressive ones combining together both faces of Progressive rock with the energy of heavy metal as well as the elegant melodies and progressions of classical music with the more groovy nature of pop and the more articulated fusion soundscapes. The project is getting more and more known for the creativity of the compositions.