The Rudest Things You Can Do At A Concert
“During a performance at the theatre, opera, ballet, and similar settings, the only sounds should be coming from the stage,” said Jodi R.R. Smith, president of Massachusetts-based Mannersmith Etiquette Consulting. “This means no talking while the singers, dancers or actors are performing.”
Article source: https://www.huffingtonpost.co.uk/entry/the-rudest-things-you-can-do-at-a-concert_uk_6400c535e4b0bdb99f4a98c8