Self-teaching since 2/3 years, with composition as main goal. First I spent some time identifying the main topics (music theory, counterpoint, form, orchestration, jazz, 20th century techniques, post-tonal theory, DAW, etc...) and finding appropriate books (r/musictheory and r/composer where great sources for that). Then, studying these books by taking notes and practicing (listening, composing, studying scores). These notes represent today ~20 PDFs and ~1300 pages.
Younger, I also studied piano and bit of music theory at school.
I must admit I spent more time studying theory rather than actually practicing. I'm currently working to revert that trend ^^
A cool chord progression in Tchaikovsky's violin concerto
Audio here at 0’36 (measure 20)
It seems to feature a Neapolitan sixth chord (which follows its applied dominant) and an applied Fr+6.
Don’t hesitate to share your thoughts or correct any mistakes :)