Polonaise 17 Sample  Lesson Sample by C. P. E. Bach. BWV Anhang 123. Intermediate Level. This simple and fun Polonaise is by Carl Philipp Emmanuel Bach, son of J. S. Bach. This lesson includes a full demonstration followed by a detailed "by ear" lesson teaching the song in two to four measure sections. When you learn without print or video you memorize the song while you learn it and develop your ability to pick out other songs "by ear."