The late 1980s also saw the emergence of the first extreme metal acts, which saw little mainstream popularity in Serbia and former Yugoslavia in general during the 1980s. The thrash metal band Heller, formed in 1985, released arguably the first thrash metal album in South-Eastern Europe and was one of the pioneers of Serbian and former Yugoslav extreme metal scene. Another pioneer of the former Yugoslav extreme metal scene, speed/thrash metal band Bombarder, originally based in Sarajevo, moved to Belgrade after the beginning of the Bosnian War, where the band continued to record and perform.