As kids, many of us received home-made presents: a sweater or pair of socks, perhaps, or—if you were unlucky—a crocheted bow tie you were forced to wear when Auntie came to visit.

On today's date in 1720, Johann Sebastian Bach started a home-made present for his 9-year old son, Wilhelm Friedemann. It was a collection of little keyboard pieces designed to teach him to play the harpsichord, pieces now known as Bach’s “Two- and Three-Part Inventions.”

Here's how J.S. Bach himself described these pieces: "Straightforward Instruction, in which amateurs of the keyboard, and especially the eager ones, are shown a clear way not only of learning to play cleanly in two voices, but also, after further progress, of dealing correctly and satisfactorily with three… all the while acquiring a strong foretaste of composition."

In the case of little Wilhelm Friedemann, it did the trick. Not only did he master the keyboard, he became a composer himself.

Even just attentively listening to Papa Bach's inventions can have its rewards, according to the late music critic Michael Steinberg, who wrote, "Bach has done such a good job at instilling 'a strong foretaste of composition' that… they will make the hearer a better, … a more aware and thus a more enjoying, listener as well."