Above all, Chopin was the greatest master of counterpoint since Mozart. This will appear paradoxical only if we equate counterpoint with strict fugue… - Charles Rosen

Visual delight, sentiment, and exploration become one in the new appreciation of landscape and Nature.

Some of the Etudes in the first set, opus 10, were written by the time Chopin was twenty. It is with these pieces that Chopin's style was fully revealed in all its power and subtlety. Later works are sometimes more ambitious and, in a few cases, more audacious, but there were no radical changes of style, nothing to compare to the later revolutions we find in the careers of Haydn and Beethoven, or even in the shorter lives of Mozart and Schubert. Chopin's mastery was proven with the twelve Etudes of opus 10.

In almost every edition (and consequently most performances) of Chopin's Sonata in B flat Minor, Op. 35, there is a serious error that makes awkward nonsense of an important moment in the first movement. The repeat of the exposition begins in the wrong place.