he Inventions and Sinfonias, BWV 772–801, also known as the Two- and Three-Part Inventions, are a collection of thirty short keyboard compositions by Johann Sebastian Bach (1685–1750): 15 inventions, which are 2-part contrapuntal pieces, and 15 sinfonias, which are 3-part contrapuntal pieces. They were originally written as musical exercises for his students.

Bach titled the collection:

Honest method, by which the amateurs of the keyboard – especially, however, those desirous of learning – are shown a clear way not only (1) to learn to play cleanly in two parts, but also, after further progress, (2) to handle three obligate parts correctly and well; and along with this not only to obtain good inventions (ideas) but to develop the same well; above all, however, to achieve a cantabile style in playing and at the same time acquire a strong foretaste of composition.

We’ve featured Invention No.2 already, but as a keyboard piece.  I love this rendition of it. :)