From when he was a student Willem Tanke based his ideal of playing the organ on observations on Bach's keyboard playing made by contemporaries of his. These observations all point in the same direction: that Bach was able to achieve a maximum of expression with a minimum of movements of hands and feet only. Achieving more by doing less became a guideline for Tanke's daily practice and he recorded Messiaen's complete organ works and Reger's monumental Variationen und Fuge über ein Originalthema op. 73 in this spirit. He calls this way of making music "The art of playing with relaxed precision" or —on a spiritual level, as a way of submitting the ego and transmitting music from a supernatural source to audiences— "The Art of Doing Nothing".

Faithful to his ideal of playing the organ Willem Tanke continually develops his own musical language through numerous exercises. Almost invariably these exercises concentrate on a certain musical idea —an "invention"— which is generated through improvisation. An exercise may evolve into a composition, which in its turn may be a starting-point for new improvisations etc. Consequently, improvisation, interpretation and composition are parts of a cycle which is constantly repeated, as the heart beat of a daily practice.