The sixth volume in our complete edition of MarbrianoÔÇÖs music contains his Mass Mi mi, which the editor considers to be ÔÇÿone of OrtoÔÇÖs most important and mature worksÔÇÖ. As well as making persistent use of the falling-fifth motif familiar from OckeghemÔÇÖs Mass Mi mi, Orto incorporates into each movement an appropriate Mass ordinary plainchant, and in the Kyrie he seems also to allude to the anonymous monophonic chanson Petite camusette. For four voices: ATTB. x + 36 pages. ISMN 979 0 57039 131 8.