This work investigates the structural and harmonic innovations within Mozart's Fantasia in D Minor, K. 397. The author, Wolfgang Amadeus Mozart, utilizes this composition to explore the boundaries of the classical keyboard form, blending improvisational elements with rigorous thematic development. The piece serves as a primary source for understanding the transition from the galant style to the more expressive, proto-romantic sensibilities of the late 18th century.

Musicologists and performers frequently cite this piece as a foundational example of Mozart's late-period keyboard experimentation. Experts highlight the work's structural ambiguity as a critical point of study for students of classical composition.