||The sixth volume in our complete edition of Marbriano’s music contains his Mass Mi mi, which the editor considers to be ‘one of Orto’s most important and mature works’. As well as making persistent use of the falling-fifth motif familiar from Ockeghem’s 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.