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Matthias Schneider is the Professor of Church Music and Organ at the Greifswald University and the president of the GdO (Gesellschaft der Orgelfreunde -Society of Organ Friends).
"And then he wrote his own tries, but not to play these pieces one to one within the service but to learn how to manage, how to improvise, how to get the right counterpoint to cantus firmus. In my opinion, this is not music to be played, as we do today but music as a starting for its own improvisations."
Video version of our conversation: