Labor history of the United States. The labor history of the United States describes the history of organized labor, as well as more general history of working people, in the United States. Unions have been important components of the Democratic Party, but that began in the 1930s.
In a more modern usage, a symphony or symphony orchestra is an orchestra, particularly one that plays or is equipped to play symphonies. Going to hear a symphony orchestra play is sometimes called going to the symphony, whether or not an actual symphony is on the program.
The first movement of a symphony usually has a structure called sonata form. Sonata form is simple, and understanding it will enhance your appreciation of almost all classical music. What follows is simplified further still, but it applies to the first movement of most classical symphonies.