Revised and Amplified by Johannes Klingenberg. Dotzauer's Violoncello Method, Opus 165 was revolutionary upon publishing, advocating, for example, the novel practice of holding the bow at the frog and not above it. Dotzauer also published a variety of other pedagogical works, most of which are still commonly used today. This method was published with a second cello part both to add interest to the exercises and to introduce ensemble playing.