A notable manuscript from the late 15th century, housed today in Naples, contains a cycle of six cantus firmus masses all based on the chanson L'homme armé which can be regarded as a treatise on polyphonic composition as well as providing even more examples of masses based on this ubiquitous theme.Whilst surviving virtually complete the Naples manuscript has alas been shorn of its rich illuminations, losing along the way the identity of the composer of this unparalleled masterpiece from the late 15th century, although some scholars are inclined to believe that it was Antoine Busnois, a leading musical figure at the Burgundian Court of duke Charles the Bold, but whose compositional output remains little-recorded. Armed with their own artistic insights and detective work and an unfailing grasp of the musical language of the 15th- century (witness their three discs of music by Guillaume Dufay on Glossa and the more recent a capella Stella del nostro mar album) Giuseppe Maletto and the musicians of Cantica Symphonia unlock the enigma of these L'homme armé masses, unveiling a real treasure of an early Renaissance musical masterpiece. A full performance of the sixth Mass is interspersed with fragment, played instrumentally, from the preceding five and complemented by a contemporary Magnificat setting.