You Will Remember (1941)
I only watched this because Robert Morley was in the lead role of Tom Barrett (stage name Leslie Stuart) - the film being the biography of this then famous songwriter ("Lily of Laguna" etc.) who put together a number of very successful shows and then plunged back into poverty after living the high life.
Interesting to see a tiny 13 year old Roddy McDowall playing a waif half that age, when the film shows the early life of Barrett/Stuart as a boy piano playing prodigy, and how they then parted and came back together again with McDowall as his old pal Bob Slater becoming his carer in the film. This character may have been created for the film, of course.
Certainly not everyone's cup of tea, but a pleasant film nonetheless. No one else of any note that I knew in it.