Classical music is a genre of music that originated in the traditions of Western art music, spanning roughly from the 9th century to the present day. It is characterized by its structured forms, complex harmonies, and use of orchestral instruments. Notable composers include Johann Sebastian Bach, Ludwig van Beethoven, and Wolfgang Amadeus Mozart, who have significantly influenced the development of this musical style. The genre is often divided into different periods, such as the Baroque, Classical, and Romantic eras, each with distinct characteristics and innovations. Classical music is typically performed in concert halls and is often associated with formal settings, showcasing the skill of musicians and the beauty of composed works.