Wow, this is a big challenge. I don't doubt you'll make it. I look forward to hearing the result. In the meantime I hope to be able to accompany you in the process. I even feel motivated thanks to this, Rachmaninoff is a great composer. There is a romanza for violin and piano that I have always wanted to play. Thank you for showing us your progress, your way of studying and sharing your anecdotes. P.S. I'm sure you've been dreaming about that F major chord, and it's haunting you ha ha ha ha! I see it more from why the ear is used to, and it's possible that it's references from the past. Good job my friend, cheers