The Bach Inventions are short, two-part contrapuntal pieces written as musical exercises for his students. There are fifteen Two-Part Inventions, arranged in order of ascending key and covering the eight major and seven minor keys.
One of my favorites of these is Invention No. 14 in Bb major (BWV 785). Here are recordings of two different interpreters of No. 14. Enjoy them both!
Pianist, András Schiff
Pianist, Glenn Gould