Ruggero Leoncavallo's La bohème; Eugen d'Albert's Tiefland; and Leonard Bernstein's Candide have all been key works in the house's program-building policy. Vocelka has also continued a tradition of staging benefit concerts for many charitable and humanitarian concerns and has made the theatre available for cultural and social events. In 2003, the opera's ballet corps merged with the noted Prague Chamber Ballet company to create the Prague State Opera Ballet. Archives An important part of the Prague State Opera's operation is its Documentation Centre. Apart from keeping systematic archival records of the theatre's activities, it has focused on the reconstruction of the lost archives of the New German Theatre. In 2004, the Prague State Opera published, with the Slovart publishing company, a book on its history, The Prague State Opera: A History of the Theatre in Pictures and Dates. The book, with texts in Czech, English and German, documents the history of the opera house from the New German Theatre to the present. Drawing material from a wide array of sources, both domestic and international, the publication grouped together an invaluable literary and photographic archive, including a number of documents which were published for the first time. See also List of opera houses References Further reading Tomáš Vrbka: Státní opera Praha. Historie divadla v obrazech a datech 1888-2003 / The Prague State Opera – Theatre History in Pictures and Dates 1888-2003 Slovart, Praha 2004, External links TACE – entry in TACE database Opera houses in the Czech Republic German diaspora in the Czech Republic Theatres in Prague 1888 establishments in Austria-Hungary Music venues in Prague Fellner & Helmer buildings Theatres completed in 1888 Music venues completed in 1888