Improvising early music : the history of musical improvisation from the late Middle Ages to the early Baroque / Rob C. Wegman, Johannes Menke, Peter Schubert.
What is counterpoint? / Rob C. Wegman -- "Ex centro" improvisation : sketches for a theory of sound progressions in the early baroque / Johannes Menke -- From improvisation to composition : three 16th century case studies / Peter Schubert.