Through his peculiar style of performance, Chopin imparted a constant rocking with the most fascinating effect, thus making the melody undulate to and fro, like a skiff driven on over the bosom of tossing waves. This manner of execution, which set a seal so peculiar upon his own style of playing, was at first indicated by the term Tempo rubato, affixed to his writings : a Tempo agitated, broken, interrupted, a movement flexible, yet at the same time abrupt and languishing, and vacillating as the flame under the fluctuating breath by which it is agitated. In his later productions we no longer find this mark. He was convinced that if the performer understood them, he would divine this rule of irregularity. All his compositions should be played with this accentuated and measured swaying and balancing. It is difficult for those who have not frequently heard him play to catch this secret of their proper execution. He seemed desirous of imparting this style to his numerous pupils, particularly those of his own country. His countrymen, or rather his countrywomen, seized it with the facility with which they understand everything relating to poetry or feeling; an innate, intuitive comprehension of his meaning aided them in following all the fluctuations of his depths of aerial and spiritual blue.




 -Franz Liszt