G. Henle Publisher’s release of the thematic catalogue by Krystyna Kobyla?ska in 1979 was a milestone for Chopin research. The author took her 1977 manuscript catalogue written in Polish as a basis, expanding this information to include the latest scholarly findings about the publication history of Chopin’s works. Ever since a systematic overview of the complete works and sources has been made possible. For each work details are given of the most significant manuscripts, first editions, the so-called students’ copies, relevant correspondence and secondary literature. Kobyla?ska’s own system for works without opus numbers, the KK-numbers, quickly became established and are still valid today. The Kobyla?ska thematic catalogue is still the first point of reference for anyone seeking to examine Chopin’s compositions more closely.