His music career began in 1985 in the Hungarian metal band Tormentor, which reached cult status in black metal circles with their first album, Anno Domini. On the strength of his work in Tormentor, he was invited to perform vocals on the De Mysteriis Dom Sathanas album by Norwegian black metal band Mayhem after then-vocalist Dead committed suicide.
He is considered a shadow member of the American doom/drone metal band Sunn O))). He has recorded five full-length albums with the group, including the most successful Monoliths & Dimensions, and performed live with the band on their worldwide tours.
In 2004, Csihar rejoined Mayhem after the departure of Maniac, the band's previous vocalist. Their 2007 album, Ordo ad Chao, won the Spellemannprisen (also known as the Norwegian Grammy). Since then the band has embarked upon intense international touring.
Csihar started his solo act in November 2008, called Void ov Voices. The group's live performances have been in support of artists like Ulver, Bohren& der Club of Gore, Lustmord, Ruin and Diamanda Galas. He performed at "The Grand Reincarnation" Of Paul Booth’s Last Rites Gallery & Tattoo Theatre.