Mountainhead is a super-satirical chamber piece about the deranged, cynical and facetious mindset of the uber-wealthy... it may not have the dramatic richness of Armstrong's TV meisterwerk.
Did Sammie sell his soul? I've written about how I think Sammie might have sold his soul. The end-credits scene shows him with no scars. That means that it takes place before the events depicted in the movie. Does he attract Remmick because he has access to another dimension? Is the scene showcasing Black music in the middle of the film a sign that he can tap into the divine because of an encounter with an otherworldly being? The next film could show us the answer.
