Music Theory

Post any websites and/or books you have used to learn music theory or any you think is a good source to do so.
It can be broad or specific.
Simple or complex.
Or just a page of general tips on composing and mixing.

Then I will read all of them and become a music master.
After that, I will edit my post and compile a list of all your suggestions so that members wishing to learn theory can quickly find multiple good sources.

1 Like for learning. for building skills.