twocats Sorry, I have to disagree with this! They change up the syllabus every few years too. The whole point of buying a book is that you have music to choose from right in front of you!
I had to think about this and wanted to take time to answer. First, you may be more up to date than I am. Then also there is the idea of "syllabus".
When I got the syllabus, there had already been 10 years between myself and a family member who had started before me. What I saw then pretty well matched what had been there a decade before. It may be that things have changed since then, if you examined all this in more recent times.
The second thing is the word "syllabus" which I discovered may mean something different to people. I've seen some people think of it as a list of material, like books, or pieces and such. That is not how I understand "syllabus". This on-line definition is how I understand it, going back to my old teacher training: "an outline of the subjects in a course of study or teaching." So if in math, the grade 2 syllabus says that the concept of multiplication should be learned with particular skills ---- then which book you use, which specific exercises you devise, have nothing to do with the syllabus. In a music syllabus, if the skills and concepts remain the same, then different pieces of music or etudes being featured would not indicate a change in the syllabus.
Which are you thinking of? (thx)
I also literally don't know how any of this has evolved, because my experience is now almost 20 years old.