Obretenov

Varna Mixed Choir, Rousse Mixed Choir, Angel Boukureshtliev Plovdiv Singing Society, Bourgas Mixed Choir, Yambol Children's Choir, Sofia Arfa Female Choir, Kazanlak Children's Choir, Vassil Arnaudov Sofia Chamber Choir, Dobrich Children's Choir, St. Ivan Rilsky Male Choir, Sofia Male Chamber Choir, Ste. Sofia Mixed Choir, Emanuil Manolov Male Choir, Harmonia Mixed Choir, Rodina Mixed Choir, Plovdiv Female Choir, Sofia Youth Choir, The Polyphonia Chamber Choir of Sofia, Lyubomir Pipkov Sofia Chamber Choir, Hristina Morfova Female Choir, Shumen Children's Choir, Bulgarian National Radio Children's Choir, Sliven Children's Choir, Sofia Boys' Choir, Marin Chonev, Mihail Angelov, Krikor Chetinian, Stoyan Kralev, Stefka Pastarmadjieva, Ophelia Russeva, Petya Pavlovich, Theodora Pavlovitch, Zahari Mednikarov, Krum Maximov, Dimiter Rouskov, Valentin Bobevski, Hristo Arishtirov, Emil Minev, Vassil Arnaudov, Ivelin Dimitrov, Liliya Gyuleva, Veneta Vicheva, Hristo Nedyalkov, Metodi Grigorov, Adriana Blagoeva

Marta Simidtchieva (cello), Kris Pineda (piano)