Erfindung is a piece that started as a counterpoint exercise that expanded to three movements. It is based on the structure of Back’s early 2-part inventions and fugues. The word Erfindung literally translates from German to mean “invention.” Einundzwanzig translates into English as one and twenty (21). The one represents that it is the first movement and the two represents how many voices are used. The second movement Zweiundzwanzig translate as two and twenty (22). Similar to the previous movement the first two represents that it is the voices present and the second two the movement. Lastly Dreiunddeißig translates as three and thirty (33) with the first three representing the voices present and the second three representing the movement number.