The National Library Department of Music is the largest center of its kind in the Czech Republic. It was established in 1923. Its founder and first director Ladislav Vycpálek, himself composer and philologist, laid out the collection policy to acquire, process and make available the broadest possible variety of primary and secondary sources with emphasis on bohemical materials. The year 1965 marks the inception of the Union Catalog of Music which registers music historical sources in the Czech Republic.