The great bass Kurt Rydl held a master class with the soloists from the upcoming premiere of the opera "Der fliegende Holländer" by Richard Wagner.
See Daniela Lalova's meeting with him.
https://bnt.bg/news/operniyat-pevec-kurt-ridal-s-maistorski-klas-v-balgariya-v321336-306543news.html