As for me, when you come across such features as<span> the piano playing, stopping, and playing it can signify that the author of a movie/book wanted to create special mood for the reader, I would say either to frighten a reader or to add a suspense because usually after such twists something unexpected should happen.
Hope youwill find this answer helpful.</span>
C.
Has been working.
Progressive means it would have started in the past, and has *progressed* to the present.
These usually have words that are not in the dictionary and not used in formal or regular English . They also can involve events that are impossible or not likely to happen in real life