<human>: I'd like to know more about the symphony?
<bot>: The symphony is a musical composition for orchestra, typically consisting of four movements. It was developed in the early 19th century by composers such as Wolfgang Amadeus Mozart and Ludwig van Beethoven. A symphony typically has three parts - the first movement introduces the main theme or subject of the piece; the second movement develops this theme and adds variations on it; and the third movement brings the music back to the original key and concludes the work.