The pieces contained in this volume prepare the student for the playing in three and four parts that is required for the perfomance of the three-part inventions and the French suites. They are most appropriately incorporated into the teaching material after the two-part inventions have been studied. New technical problems, such as the passing under and over of fingers without using the thumb and the rapid substitution of fingers on one key, must here be solved. In order to make the fonn clear, t...