What should be taught in schools?

This is my list of what should be taught in schools, and yes, it is biased of course, with music at the top....

1: Theory of Music (Elective class)
2: Music Practical (playing instruments) (Elective class)
3: Visual Arts (for traditional and digital art, such as 3D modelling) (Elective class)
4: Languages (English, Spanish, French, Japanese, Chinese) (Mandatory for at least one language)
5: Theory of Knowledge (Mandatory)
6: Mathematics (Mandatory)
7: Humanities (Geography, History, Economics, Business & Management) (At least one is mandatory)
8: The sciences (Physics, Chemistry, Biology) (At least one is mandatory)
9: Physical fitness/Martial Arts (Elective class)

This is basically what is taught at the AICS, with some minor exceptions. I couldn't really think of anything different.

Religion is not listed because everyone will have different beliefs in a given class group; a class where atheists are taught about God and Christians are taught about Islam is obviously not practical.
Language: In my opinion, every school should offer at least all of those languages listed above.
Visual Arts: In this day and age, programs such as photoshop are being used more and more (e.g. advertisments) and we should be taught how to use it in school.
The Music practical class would simply be a time for students to practise playing their respective instruments. In my opinion, every school should have a concert grand piano... but I am getting off-subject....
I think that it is important that Physical Education be offered in schools, but for other students, their time would be better spent, say, practising the pianoforte, and thus PE shouldn't be mandatory, in my opinion.