Impromptu means – as Ex tempore – something created or performed without prior preparation. The term is often used in music, theater, and speech to describe spontaneous expression or composition that arises in the moment.

In classical music, an Impromptu is typically a short, lyrical piece that gives the impression of improvisation. Despite being written down, such works aim to capture the spirit of Ex tempore creativity and emotional immediacy.

"Clavichord" is a historical keyboard instrument that was widely used from the late Middle Ages through the Classical period. It produces sound by striking metal strings with small brass blades called tangents, which remain in contact with the strings as long as the key is pressed.

Known for its quiet and intimate sound, the clavichord allows for expressive techniques such as vibrato (called "bebung"). Because of its sensitivity and dynamic subtlety, it was often favored for private music-making, practice, and composition. In this recording, a physically modeled Neupert clavichord is being played.