(n.) The keyboard of an organ, pianoforte, or harmonium.
Example Sentences:
(1) Musically trained listeners were instructed to sing the musical scale that first came to mind immediately after hearing short excerpts from Preludes of J. S. Bach's The Well-Tempered Clavier.
(2) The program has been applied to the task of analysing the metric structure of the forty-eight fugue subjects of the Well-Tempered Clavier by J S Bach.
Pianoforte
Definition:
(a.) A well-known musical instrument somewhat resembling the harpsichord, and consisting of a series of wires of graduated length, thickness, and tension, struck by hammers moved by keys.