A concert hall is a cultural building with a stage that serves as a performance venue and an auditorium filled with seats. While early halls built in the 18th and 19th century were designed for classical orchestra, concerto and opera concerts and ballet performances, halls built in the 20th and 21st century were often built to accommodate a wider range of performance types, including musicals. In the 2020s, popular music such as rock music and traditional music such as folk music are also performed in these venues.