The Lochamer Liederbuch is one of the most important sources of German-language music of the 15th century. As one of the earliest surviving German songbooks, it contains mainly one-part songs and a collection of instrumental music As a special feature, the latter includes the “Fundamentum organisandi”: a composition and improvisation tutor for keyboard instruments. In vocal music, this kind of instruction book already had a long tradition at the time, but for instrumental music it was an innovat...