Being non-commercial is never an ambition. Movies come together at different points for fortuitous reasons. You do them as you get the opportunity, as opposed to doing them when you choose to or design to.
The mountain music... is compelling music in its own right, harking back to a time when music was a part of everyday life and not something performed by celebrities.
When the movie's done, you talk about either the score or source music over a particular scene, what might work. You just throw a piece of music over the scene, and we both listen to it.