Vereinigte Bühnen Wien (VBW), a Wien Holding company, stages top-class opera and musical productions in its four historic Viennese theatres - Raimund Theater, Ronacher, Theater an der Wien and Kammeroper. Every year, up to 600,000 people attend the performances in the four theatres, of which around 500,000 attend the long-run musical productions in the Raimund Theatre and Ronacher. This makes Vereinigte Bühnen Wien one of the largest multi-discipline theatre companies in Europe.