Don or Doc Shirley was an afro-american pianist and composer (Movie: GREEN BOOK)
I am looking for midi files or written music (especially his interpretation of blue skies:
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The only thing I've found is on MuseScore: what appears to be a fan transcription of "Happy Talk" from the movie.
No other works turned up in searches of WorldCat, JWPepper (a music retailer), or "the internet". I can only suggest the admittedly remote possibility of contacting his estate. See this article from Time magazine.