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As an opera singer, Hůlka has performed leading roles at the Estates Theatre, the Hudební divadlo Karlín where he also sang under the direction internationally acclaimed conductor Alexander Frey, the J. K. Tyl Theatre, the Liberec Theatre, the Městské divadlo Ústí nad Labem, and the Prague National Theatre.
The most important are the two opera houses in Prague - National Theatre (Prague) and Prague State Opera and the Estates Theatre, which hosts one of the stages of the Prague National Theatre.
Supraphon LPV 337-339: Ludmila Komancová, Rudolf Asmus, Přemysl Kočí, Lubomir Havlák, Marie Steinerova, Rudolf Vonasek, Jaroslava Vymazalova, Jaroslav Horáček, Karel Berman; Prague National Theatre Chorus and Orchestra; Zdeněk Chalabala, conductor.
1975, František Jílek (conductor), Prague National Theatre Chorus and Orchestra; Naďa Šormová, Marcela Machotková, Jiří Zahradníček, Jaroslav Horáček, Zdeněk Švehla, Daniela Šounová