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The most famous Czech organist of the first half of the 20th century was Bedřich Antonín Wiedermann (1883–1951): he was a virtuoso, church organist, teacher of the Prague Conservatory and, briefly, of Academy of Performing Arts. He was also a prolific composer who intentionally composed for his instrument – the organ. He wrote other music too, mostly chamber pieces, sacred music, songs and choral works. The most important source is his legacy kept in the Czech Museum of Music in Prague, there are mainly his compositions in autographs, authorized copies and prints, both from Wiedermann's devoted copyist and printer Josef Milota. The first one who sorted Wiedermann pieces was his nephew and pupil Jan Bedřich Krajs, he put relevant manuscripts together and wrote titles and remarks there. I began cataloguing Wiedermann´s output in 2018 what helped me to follow e.g. places Wiedermann visited, friends to whom he dedicated his pieces. Some pieces are only in sketch, some in several versions, some in fair copies with remarks of dynamics, manuals, stops, duration, so it is clear these were used for performance. Individual pieces are kept the music archive of Czech Radio and private archives of Wiedermann's relatives, pupils and organ enthusiasts. The paper presented questions around Wiedermann´s pieces and problems of cataloguing his music output.