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As this is in a different opera to the one she is starring in I don't see what it has to do with her. I just wondered if many black people would be offended.
For those who don't know, Anna Netrebko, the singer she is talking about, is IMO the most famous soprano singing in the world today so I doubt she'll be bothered.
I remember my first opera when my son took me to the RoH Covent Garden to see Madame Butterfly. It was not a Japanese soprano in the title role.