This dissertation thesis is focused on music performance within the bounds of Order of the Cross with Red Star in the 18th century. The history of the Knight's Order rises from the first half of the 13th century and concerns the only original Czech church order. In the 18th century Knights of the Cross belonged to the most significant patrons of Art in Czech lands. Church and monastery of St. František in Prague, the center of the Order, became the most influential culture center. The charity work of the Order of that time influenced the creation of the extraordinary institution - the Order's menza that had the significant importance for operating of organ lofts of St. František Church because it provided the sufficient amount of singers and musicians. The research is exclusively based on non-music materials deposited in the Cross paper fond (Nr.195) consigned in the 1st department of the National Archives in Prague. According the information of the inventory department, the fond contains altogether 2315 cartons of paper material and 3306 books. Until now, the researchers have been interested in these sources only marginally which was caused mostly by its disorderliness and most important discoveries have been realized mostly just by lucky coincidences. The main part of this work is devoted to St....