Back in the 19th Century there was often a lot of commotion at classical music concerts. There were partisans for one composer or another (the great Brahms vs. Wagner battles were famous between each others supporters) and there would be booing at concerts with the rival's music. Famously at French Operas it was required to have a ballet featuring female dancers in the second act of the opera. First, it employed the cast of ballet dancers who had a second job earlier in the opera. During the first act, the ballet dancers would meet with their male admirers who would be skipping attending the first act for dinner and their amourous trysts. Then after the intermission, the admirers would take their seats for the second act to see their favorites dancing in the ballet.
Wagner famously had written his opera Tannhauser for German audiences with no ballet. However, for the Paris version, he was forced to write a ballet. Because of the plot line the ballet took place at the beginning of the opera, the famous Venusberg scene, not in the second act. This infuriated the wealthy men who were forced to watch the first act and the ballet, rather having their meetings with the ballet dancers. It was said they hired a bunch of hooligans who yelled out cat calls and blew whistles and made other disruptions to the opera. Wiki gives a slightly sanitized version of the story (see Tannhauser Paris Version.) Wagner was forced to withdraw the opera from Paris.
Larry