Psalm Differentiae in the Fifteenth-Century Olivetan Psalter Manuscript at the Łódź Archdiocesan Museum in Poland

Abstract This article presents the psalm differentiae in the fifteenth-century Olivetan Psalter kept at the Łódź Archdiocesan Museum, the only book of this provenance that has been identified in Poland. The author identifies psalm differentiae and determines the degree to which they belong to the most widely applied euouae schemata in musical manuscripts and to what extent this book may contains euouae melodic variants without a correspondence in the chant tradition. The codex contains single psalm cadences which, if confirmed by further source research, may be considered original.