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‘This Chansonnier, named by Knud Jeppesen as the perhaps most interesting and valuable medieval music handwriting in the Royal Library, occupies a special position among the relatively few manuscripts that surrender the French-Burgundian Chansons repertoire from the late 1400s. The script contains text and nodes for 33 three-star songs. A song – “Iactens secours” – was added in the 16th century. In conclusion, there are a number of “modulation exercises.”‘