YU Grupa, formed in 1970 by former Džentlmeni members, brothers Dragi and Žika Jelić, were one of the pioneers in incorporating elements of traditional music of the Balkans into rock, and achieved huge popularity with their fusion of progressive/hard rock and folk found on their 7-inch singles. Members of YU Grupa performed as a support band for guitarists Bata Kostić, Vedran Božić, Josip Boček and Goran Bregović on the "Kongres rock majstora" ("Congress of Rock Masters") concert and album. YU Grupa disbanded in 1981, but reunited in 1987, continuing to record successful hard rock-oriented releases throughout the late 1980s, 1990s and the 2000s.