The study focuses on the repertory of the literary brotherhood in Roudnice nad Labem. It aims to evaluate a recently discovered inventory of 1591, and attempts to dating two musical manuscripts, currently kept in Roudnice priory (CS-ROU A and CS-ROU B). The first, a fragment of a multivolume gradual was identified as one of the items listed in the above-mentioned inventory. The second, rorate hymn-book with added polyphonic voices – whose pertinence to the repertory of the local literate brotherhood was, however, not possible to prove – contains extended quadriple voice mass with seven parts, which is analysed in detail by the study