“练习曲”原是作曲家们为学生练习某种演奏技巧而创作的曲子。它往往是依据单一的音乐动机写成的。这类曲子很多，仅１９世纪欧洲作曲家就写有上千首。最早和系统地写钢琴练习曲的是约翰，塞巴斯蒂安·巴赫。他的《１２平均律钢琴曲集》里的“前奏曲，有很多都带有“练习曲” “Etude” was originally composed by composers for students to practice some kind of playing skills of the song. It is often based on a single musical motivation. This kind of song is a lot of, only nineteenth Century European composers wrote thousands of first. The earliest and systematic writing of the piano’s Etude was John Sebastian Bach. Many of his prelude to his 12th Mean Law Piano Collection include “Etude”