After studying for some years with Spasić, his teacher sent him to the voice studio of the famous mezzo-soprano Biserka Cvejić at the Music Academy in Novi Sad in 1991.
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Some of the Verdi roles which he has sung in Frankfurt are Amonasro in Aida, the Count di Luna in Il trovatore, The Duke of Nottinghamin Donizetti's Roberto Devereux, Ezio in Attila, Germont, Guy de Montfort in Les vêpres siciliennes, and Renato in Un ballo in maschera.
Željko Joksimović | Željko Ivanek | Željko Čajkovski | The Best of Željko Joksimović | Željko Ražnatović | Željko Obradović | Željko Malnar | Željko Lukajić | Željko Kalac | Zeljko Joksimovic | '''Željko Jerkić''' (speaking), at the Conference on Facilitating the Entry into Force of Comprehensive Nuclear-Test-Ban Treaty | Zeljko Ivanek | Željko Blagojević | Vladislav Lučić | Hanibal Lucić |