From a quality point of view, this series of books is excellent with laminated pages and solid yet my son is far from a tender with its business. The quality is very good explanations, the designs are simple but well illustrate the text. For the specific case of "Music", it makes us aware that music is all around us. We review the different instruments to prehistory and today in different countries. The instruments are also classified by families (strings, winds, percussion). It is very rewarding for children from 3 years and much more!