Bolshoi Theatre (built in 1824) is the most famous Russian theatre of opera and ballet in the world. It has always been and remains one of the major symbols of Russian culture. The Bolshoi is a repertory theatre and normally introduces two to four new ballet or opera productions each season. The performers are drawn primarily from the Bolshoi´s regular ballet and opera companies, with occasional guest performances. The success of touring performances is hard to overestimate, but Bolshoi is oriented primarily to the domestic audience. It offers the variety of repertoire choices ranging from the national classics and worldwide masterpieces of music to the new work as well as chamber and symphony concerts.

Sources, related links:
Adapted from: Wikipedia - Bolshoi Theatre
Official web site of Bol´shoi Theatre