Well, many harmonica experts will not appreciate my comments on this question: etudes which have no connection to actual music are entirely worthless, or worse, a complete waste of time.

• 很多口琴专家都不会欣赏我对这个问题的解释：跟实际音乐没有联系的练习曲是完全没有价值的，或更糟糕的是，完全是浪费时间。