[999900000999]

Sounds like someone needs to be awesome and release midi files of classic compositions.

You have the rare hip hop song which samples classical music directly, but I really want to learn music theory, like understanding how the notes work.

[8bitsrule]

The classics are out there, but often they've been performed by someone. Easy to strip down to the notes with a good MIDI editor.

It's been a long while for me, but a search on 'classic midi files' turned this up. (Hard to tell if it's crap without a listen.) https://www.midiworld.com/classic.htm