La Scala

The less affluent residents of Milan watched performances standing, on the first floor of the theater.

An excerpt from the article 15 facts about La Scala

This was the case until 1897 when seats were installed there (now more than 2000 people can sit there). On the gallery (loggione) above the boxes sat the most discerning music lovers and journalists. The orchestra was in full view, as the moat for the orchestra had not yet been built.