The hand-copied set of lute tablatures from the Cistercian Abbey in Krzeszów (Grüssau), originating from the first half of the 18th century, provides indications of a rich and varied musical life of Silesia at the time. It contained at least eleven books, now dispersed between the National Library in Warsaw, University of Warsaw Library and Wroclaw University Library, with over 1500 compositions of various kinds: dances, German and Latin religious chants, mostly for solo lute, sometimes accompanied by other instruments or adapted for two lutes. Among them, those composed by two musicians from the German-speaking area stand out. The first is Georg Philipp Telemann, who worked in Silesian Zary (Sorau) in 1704-1709, and whose identity is disguised by the anagram 'Melante'. The second is Silvius Leopold Weiss. For the most part however this repertory needs to be identified by complex comparative research. This method is used to investigate compositions of Bohemian lutenist Johann Anton Losy and their concordances.