Attila Gábor Csihar, also sometimes known as Void, is a Hungarian extreme metal vocalist, best known for his vocal work in Norwegian black metal band Mayhem and American drone-doom project Sunn O))). Author Ian Christe describes his vocals as »operatic«. 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. After Mayhem, Csihar continued to work in various bands, such as Plasma Pool, Aborym, and Korog; he also performed as Caiaphas in the rock opera Jesus Christ Superstar in Hungary. He briefly performed in Keep of Kalessin as well. He is considered a shadow member of the American doom/drone metal band Sunn O))). 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 Galás. He has collaborated with such artists as Current 93, Jarboe, Dissection, Emperor, Taake, Ulver, Toby Knapp, Banks Violette, and Nader Sadek, the artist behind Csihar's masks with Sunn O))) and Mayhem. In 2016, Csihar joined blackened death metal supergroup Sinsaenum. The band released its debut album Echoes of the Tortured on July 29, 2016 via earMUSIC.