A symphony is a large musical composition typically written for an orchestra. It usually consists of multiple movements, each with its own distinct character and tempo. Symphonies are often structured in a specific form, such as sonata form, which helps organize the musical ideas presented throughout the piece. Symphonies have been a significant part of classical music since the 18th century, with famous composers like Ludwig van Beethoven and Wolfgang Amadeus Mozart contributing to the genre. They are performed in concert halls and are celebrated for their complexity and emotional depth, showcasing the talents of various instruments within the orchestra.