Every human soul seeks placidness. The best way to reach it is any sort of intellectual activity. "Musication" (playing a musical instrument for oneself) is one of such activities.
Unlike performing, musication requires no audience apart from those who are playing. This process - the process of musicatrion, let people hear their inner selves. That is the reason why amateurs choose such pieces of music for musication that do not require any special professional skills or serious intellectual efforts.
The piano works presented in "The Lessons of Musication" mostly have educational purposes. The author suggests that fingering is the keystone of pianism. Therefore, he emphasizes on fingering in The Music Classes. At the same time, dynamics is hardly ever a key component in the piano works by the author and he is short on phrasing. According to the author, dynamics and phrasing are supposed to be created by the pianist.
Musicality is diverse. Music might have both positive and negative impact on people. Besides good feelings it might provoke aggression or depression. In some cases it might even develop the sense of self-idiocy. :)
The piano works included into The Music Classes are ariose and melodious. That music follows classical European traditions and is composed in time-honored musical language. Due to the harmony and melodism of that language people living long ago could easily understand it and our contemporaries have no difficulty in understanding it either. The author expects future generations to understand it, too. Time will show whether the author is right or wrong.