music. The Serbian composers of the first generation Petar Konjović, Stevan Hristić, and Miloje Milojević maintained the national expression and modernised the romanticism into the direction of impressionism. Other famous classical Serbian composers include Isidor Bajić, Stanislav Binički and Josif Marinković. There are three opera houses in Serbia: Opera of the National Theatre and Madlenianum Opera, both in Belgrade, and Opera of the Serbian National Theatre in Novi Sad. Four symphonic orchestra operate in the country: Belgrade Philharmonic Orchestra, Niš Symphony Orchestra, Novi Sad Philharmonic Orchestra and Symphonic Orchestra of Radio Television of Serbia. The Choir of Radio Television of Serbia is a leading vocal ensemble in the country. The BEMUS is one of the most prominent classical music festivals in the Southeastern Europe. Traditional Serbian music includes various kinds of bagpipes, flutes, horns, trumpets, lutes, psalteries, drums and cymbals. The kolo is the traditional collective folk dance, which has a number of varieties throughout the regions. The most popular are those from Užice and Morava region. Sung epic poetry has been an integral part of Serbian and Balkan music for centuries. In the highlands of Serbia these long poems are typically accompanied on a one-string fiddle called the gusle, and concern themselves with themes from history and mythology. There are records of gusle being played at the court of the 13th-century King Stefan Nemanjić. Pop music artist Željko Joksimović won second place at the 2004 Eurovision Song Contest and Marija Šerifović won the 2007 Eurovision Song Contest with the song "Molitva", and Serbia was the host of the 2008 edition of the contest. Pop singers include Zdravko Čolić, Vlado Georgiev, Aleksandra Radović, Jelena Tomašević and Nataša Bekvalac, among others. Serbian rock was part of the former Yugoslav rock scene during the 1960s, 1970s and 1980s. During the 1990s and 2000s, the popularity of rock music declined in Serbia, and although several major mainstream acts managed to sustain their popularity, an underground and independent music scene developed. The 2000s saw a revival of the mainstream scene and the appearance of a large number of notable acts. Serbian rock acts include Atheist Rap, Bajaga i Instruktori, Đorđe Balašević, Bjesovi, Block Out, Crni Biseri, Darkwood Dub, Disciplina Kičme, Elipse, Ekatarina Velika, Električni Orgazam, Eva Braun, Galija, Generacija 5, Goblini, Idoli, Kanda, Kodža i Nebojša, Kerber, Korni Grupa, Laboratorija Zvuka, Slađana Milošević, Neverne Bebe, Obojeni Program, Orthodox Celts, Partibrejkers, Pekinška Patka, Piloti, Riblja