オペアンプ。 299、速度の学校
Op. 299, School of Velocity (Czerny, Carl)
Carl Czerny (21 February 1791 – 15 July 1857) was an Austrian composer, teacher, and pianist of Czech origin whose vast musical production amounted to over a thousand works. His books of studies for the piano are still widely used in piano teaching.
You can listen to the pieces in background with playlists.
The textbook is also included in this app.
Simple Design.
Have fun.
Passsong Inc.