Sorry for reviving this thread, but this post seems most appropriate here, since it is a follow-up to the previous posts.
I have completed the Coursera course. However, it does not go into enough detail for me to analyze this Chopin Nocturne. I still do not get how Chopin makes the harmonies work, in music theoretic terms. He uses half-diminished chords and whatnot, and I can not make sense of them in context. How do I approach learning this?