A musical instrument which is played by means of a keyboard.
The Inventions and Sinfonias, BWV 772-801, also known as the Two and Three Part Inventions, are a collection of thirty short keyboard compositions composed byJohann Sebastian Bach, consisting of fifteen inventions (two-part contrapuntal pieces) and fifteen sinfonias (three-part contrapuntal pieces). They were originally written by Bach as exercises for the musical education of his students.
It was given a title by Bach: "A faithful Guide, whereby admirers of the harpsichord are shown a plain Method of learning not only to play cleanly in two Parts, but likewise in further Progress to manage three obbligato Parts well and correctly, and at the same time not merely how to get good Inventions, but also how to develop the same well; but above all, to obtain a cantabile Style of playing, and together with this to get a strong Foretaste of Composition."
The two groups of pieces are both arranged in order of ascending key, each group covering fifteen major and minor keys. The sequence of keys is