Jan of Lublin was probably the first owner of the organtablature manuscript now kept in the PAN Library (Academy of Sciences Library) under the signature Ms. 1716. Perhaps he wrote some of it himself; his name is only given embossed on the cover, while on one of the pages inside the signature "Valentinus scripsit" appears. The tablature, numbering 260 pages, is considered the most comprehensive source of organ music in Europe. It includes transcriptions of religious and secular vocal music, and independent religious organ music, as well as preludes and dances. It also contains a treatise and exercises of a didactic nature in the fields of composition and organ improvisation and advice for tuning organs. Most of the repertoire is preserved in anonymous tabulature, but with many works the authorship has been identified, and some compositions have been identified from other sources. In total we can name 20 French, Dutch, German and Italian composers whose work is represented in the manuscript, and from the Poles - Seweryn Koń and the initials of Mikołaj of Krakow and Mikołaj of Chrzanów (NC N.Ch., NZ).