The discovery in 2015 of a 15th-century parchment chansonnier still in it's original binding was made still more startling because it contained twelve previously unknown, anonymous chansons. Most are rondeaus, and they range from the uncomplicated to the refined and elaborate; many bear musical indications that they are the work of the greatest composers of the period. In this recording they have been contextualised with other known songs but in the variant versions found in Leuven. As on their recording of the Chansonnier Cordiforme (on 8.573325), Ensemble Leones employs a range of performance possibilities, from a cappella ensemble to a mixture of instruments and voices.