It would appear that J.S. Bach really composed his two- and three-part Inventions (Sinfonias) on purpose to prepare his pupils for his larger works, - especially for his "Well-Tempered Clavier," - and as such they cannot be too urgently recommended. And to this day, a diligent study of these Inventions will greatly benefit every talented student of the piano who desires to rise above mediocrity; they will cultivate his musical taste and develop his technic. For in no modern, easy piece of music is the left hand given so independent of a treatment of the theme as in these Inventions. Edited By: Carl Czerny (1791-1857) Friedrich Conrad Griepenkerl (1742-1849) Friedrich August Roitzsch (1805-1889) (Note: This edition contains only the 15 Inventions, and not the 15 Sinfonias.)