The world knows Percy Grainger mostly for his folksong settings: of which the one about the English country garden is probably the most popular. Some know one or two of his more individual compositions, but (I suspect) relatively few know of his early explorations of electronic music and musical ideas that place his name with the pioneers of the avant garde of twentieth century classical music.
Percy's eccentricity was matched with a tortured(sic)sexuality that embraced a close relationship with his mother and a penchant for flagellation. The brief display of the latter is( I suppose) the reason for the "R" rating.
Richard Roxburgh's performance as Percy is excellent, and (apparently) very close to the real thing. Barbara Hershey is less convincing as Rose.
In my opinion, don't be put off by the "R" rating for this film.
I am sure many of those who stumble on this release will want to find out more about Percy Grainger and what made him and his music tick.
Not a great film, but a very entertaining one. It is very much more intelligently made than some more sanitised or fictionalised attempts to depict the nature of those who brighten our lives with their creativity.
If in Melbourne : do not miss the Percy Grainger Museum in the grounds of the University of Melbourne. It has lots of Grainger "artifacts" that document how close this film -flawed as it is - manages to recreate the setting, the times and the relationship with his mother.