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 metal band Sunn O))). Author Ian Christe describes his vocals as "operatic".

Mayhem is a Norwegian black metal band formed in Langhus in 1984. They were one of the founders of the Norwegian black metal scene and their music has strongly influenced the black metal genre. Mayhem's early career was highly controversial, primarily due to their notorious live performances, the 1991 suicide of vocalist Per Yngve Ohlin ("Dead") and the 1993 murder of guitarist Øystein Aarseth ("Euronymous") by former member Varg Vikernes of Burzum.