[1] From Chopin's letters it is known that he used the name "fantasy" to show some sort of freedom from rules and give a Romantic expression.

[1] Frédéric Chopin continued the tradition of a self-contained movement in his Fantaisie.

[2] This Fantaisie is one of Chopin's longest pieces, and is considered one of his greatest works.

[2] It begins with a solemn marching theme that eventually plunges into a passionate and virtuosic section, the transition marked poco a poco … doppio movimento, still with elements of marching, but more triumphant and positive in mood.

After a short, quiet and sweet statement followed by a final flourish the work ends in a plagal cadence in A-flat major, the relative key.