First, I'm sorry for my poor English.
I enjoy listening to classical music.
According to Schiff's analysis of Beethoven's Sonata, It seems that classical music has a certain form, so if any note changes, there is a contradiction in the musical structure within a few bars.
I want to not only appreciate the works but also understand why they should be compose like that.
While majoring in physics mathematics in a non-English speaking country, I got a lot of help from Stack Exchange in book recommendation and detailed explanation about systematic studies.
Can you recommend books or open courseware for detailed analysis of classical music works?