What is "lochamer-liederbuch"

The Lochamer-Liederbuch (Lochamer Song Book or Locham Song Book) is an extensive collection of German songs at the transition from the late Middle Ages to the Renaissance. It dates from the mid-15th century and is regarded as one of the most important surviving collections of music from fifteenth-century Germany. Other names are Locheimer and Lochheimer Liederbuch.