Piano. Some of the most often taught original piano literature by dozens of master composers of the past has been carefully selected and compiled by difficulty level. The Intermediate edition features 21 pieces by 12 composers including Carl Philipp Emanuel Bach Sofeggio in C minor H. 220 Johann Sebastian Bach Invention No. 1 in C Major Johann Sebastian Bach Invention No. 8 in F Major Ludwig van Beethoven Bagatelle in G Major Op. 126 No. 5 Ludwig van Beethoven Bagatelle in A minor Fur Elise