The imposing Valli Theatre (o Municipal Theatre), inaugurated in 1857 and named after the actor Romolo Valli since 1980, covers an area of 3.890 square meters .
The floor plan is horseshoe-shaped and consists of four tiers of boxes and a gallery capable of seating 1088 people.
The Valli Theatre hosts an intense and varied activity thanks in part to the upgrading and modernisation of the technical equipment with which the stage has been equipped, on the standard of the major European theatres, and the assiduous care taken in the preservation and complete recovery of the spaces, which allow the theatre to function las a multiple container of performances and theatrical culture: from the ridotto that hosts concerts, exhibitions, conferences, meetings with artists, to a large area of service spaces, partly transformed into the premises of the Archive and the historical disco "Agosti".
Opera, concert, dance, musical and operetta seasons are held at the Valli Theater.
Some titles of the drama season and all musical and non-musical events requiring significant capacity are also hosted.