On the other hand, addiction to music may make one...
the art and music classes should be compulsory in schools
It's not true that Maths,Physics,Chemistry are difficult to learn as the same for music! The moment you think it's difficult it becomes certainly difficult for you. On the other hand, addiction to music may make one completely isolated from the society. Dedication to a single subject may result in phenomenal success in many cases but struggling with many may result in nothing. To become a polymath with arts and music after heavy stress in other subjects may prove disastrous for many. Much of the music produced by the leading pop-stars are not fit for children of age below 14 years. As for arts, it is impossible to learn many different languages like-French,German,Spanish,Russian or Chinese and so on and as well World History for every child and memorise them. As for "Knowledge about BEAUTY" from music or arts I know not if that's possible!BEAUTY LIES IN THE EYES OF THE BEHOLDER. Again, as a profession music may be intimately connected to drug addiction which is strongly repulsive. For the above reasons, arts and music may be optional to those strongly interested but not compulsory for all school student.