During the 1950s, the first Macedonian ballet by Gligor Smokvarski and opera "Goce" by Kiril Makedonski were produced. The period after these brought a relative renaissance of Macedonian music, focussed on innovation. The most prominent composers in this period are Zivko Firfov, Trajko Prokopiev, Stefan Gajdov, Todor Skalovski, Petre Bogdanov Kocko, Vlastimir Nikolovski, Blagoja Ivanovski, Tomislav Zografski, Toma Prosev and Mihajlo Nikolovski. Among the most prominent music artists in this period are the opera singers Danka Firfova, Pavlina Apostolova, Georgi Bozikov and Zina Krelja, and the pianist Ladislav Palfi. Firfova was one of the first trained sopranos in Macedonia and debuted in 1947 as Santuzza in a Macedonian-language version of the "Cavalleria Rusticana", the first opera ever sung in Macedonian.