Heavy metal music
Critics disagree over who can be thought of as the first heavy metal band. Most credit either Led Zeppelin or Black Sabbath, with American commentators tending to favour Led Zeppelin and British commentators tending to favour Black Sabbath, though many give equal credit to both. A few commentators—mainly American—argue for other groups including Iron Butterfly, Steppenwolf or Blue Cheer. Deep Purple, the third band in what is sometimes considered the "unholy trinity" of heavy metal (Black Sabbath, Led Zeppelin, and Deep Purple), despite being slightly older than Black Sabbath and Led Zeppelin, fluctuated between many rock styles until late 1969 when they took a heavy metal direction.
Popular music in Yugoslavia
Gordi were one of the first Yugoslav heavy metal bands and are considered one of the pioneers of classic heavy metal in Yugoslavia. Hard rock group Riblja Čorba, known for their provocative social-related lyrics and controversial political attitudes of the band's frontman Bora Đorđević was one of the most important groups of the Yugoslav and Serbian rock in general. Riblja Čorba drummer Vicko Milatović formed heavy metal band Warriors, which later moved to Canada and recorded an album for the foreign market. The eminent heavy metal group Divlje Jagode from Bihać, led by guitarist Sead "Zele" Lipovača started a short-lasting international career in 1987 under the name Wild Strawberries. Another notable Bosnian hard rock group was Vatreni Poljubac led by charismatic Milić Vukašinović, formerly a member of Bijelo Dugme. Other notable hard rock and heavy metal bands include Generacija 5, Rok Mašina, Kerber and Griva from Serbia; Osmi Putnik (whose frontman Zlatan Stipišić Gibonni, later started a successful pop music career) and Crna Udovica (later changed their name to Big Blue) from Croatia; Pomaranča from Slovenia, and others. Yugoslav glam metal scene featured few acts, most notable being Krom, Karizma and Osvajači.