Sofia Opera shares a building with the ultra-nationalist party Ataka and in the letter state that the Party's supporters have and continue to severely disrupt rehearsal:
"“Every day, Ataka’s political supporters siege the building, urinate in front of it, are extremely noisy and interfere with singers’ rehearsals,”
It goes on, “Our artists cannot reach their workplace and cannot make their way home afterward. The Opera is under siege and it is difficult for a regular person to enter.”
Sofia Opera's first Ring Cycle will however continue to go ahead beginning on 22 June.
More about Sofia Opera here