This article is an attempt at interpreting some musical representations which are part of the iconographic programme of baroque paintings from 1705-1706 in St. Nicolas church in Gasawa (Northern Poland). These paintings, which were discovered accidentally during the renovation at the end of the 1990s, contain several popular themes concerning sacred music. The consecutive chapters discussed such issues as the representations of King David with his harp, St. Cecilia with her organ, the baroque, the church instrumental ensemble, the music of the angels, the trumpets of the archangels announcing the Last Judgement, and the infernal music which presages the torment inflicted on the ear. The aim of the author is to consider the issues of this musical iconography on a broader scale in the investigation of ancient musical instruments and of musical practice. Such research has hitherto been neglected by Polish musicologists.