Very good acting etc. BUT you need to look closer...

Rating: 6/10 (3 September 2018)

Technically this is really a great movie, great visuals, acting, setting etc.
In my eyes, though, the movie fails to deeper unfold the reality, thus staying at a more superficial level, which leads to something like "with maximum effort you will achieve success". But that is not always true, sometimes the result may even be fatal!
In my opinion it is very important to look more carefully at the harsh teacher in this movie: Is he a brilliant teacher, getting the best out of his students, even though he lets them bleed for that?
Let's look at his known results: 1 student was very successful, 1 student killed himself because of him. Most of his impact was "not directly shown", all the other students, being no musical geniuses, are more or less irrelevant to him, though he massively damaged their self-confidence... E.g. chances are that "fat" guy may kill himself, too, later on.
Sure, the teacher indeed _wants_ to get the best out of his students, but his methods could not be more wrong. The movie should have shown a few more minutes of footage looking at the bad outcomes for "all the other persons" terrorized. Moreover the teacher totally fails to encourage self esteem and creativity, instead he demands strict obedience and formal precision above everything else.
That man truly is mentally disturbed: What most matters should be the well being of people. In which world would we are living if many students would be formed like that? This kind of treatment badly changes the character of "successful" students to be mentally disturbed themselves (stockholm syndrom etc.), being cold and unfair to others, making society worse.
Even if one of his students manages to play one of the best concerts ever (like the drummer boy here), will that guy really be happy afterwards for more than a short time? Someone so completely focussed on success, that he goes on stage bleeding after a car accident, ignoring everything? I doubt it! Even insulting his girl friend that she is "not good enough", sacrificing the wishes of his heart, just for fame...?
Chances are that after his biggest successes, he will realize he is still not happy and will kill himself. Like it happened often enough with famous artists, sadly...
Of course, he _says_ he wants to be remembered and rather die young than not to be famous etc., but these are the words of a young boy, not having much experience, no insight in philosophy, sense of life, social responsibility, religion (Karma), morale etc. Small positive things do matter much, he just does not see it. On the other hand he overrates the impact of a successful jazz drummer, many people not even hear that type of music. In my eyes it is very obvious that the achieved success could definitely not balance out the severe social damage that was caused.
Overall, though, the movie is well done and worth watching, if you are able to look behind the curtain and see that the "way to success" shown here, is an illusion made by a mentally ill teacher.