Because of its shape, the San Carlo has very good sound quality. People can hear the singers and orchestra even in the most far away seats. Operas, ballets and concerts are performed there. People can also rent the theatre for parties or to put on their own shows. In 2010, much work was done on the opera house. It now has more rooms for rehearsals, modern machinery for the stage, and air conditioning. The Teatro di San Carlo has its own orchestra.