The only professional actor to date in Songs from the second floor plays the CEO in the Oracle in the solarium scene. You can only see his feet. My main approach towards all the elements of the movie is that I look for simplicity and clarity. This is true regarding music as well. That is why I prefer music that is simple, naked and not technically overdone.
Bad music is no better in stereo.
Good music is no worse in mono. I prefer using original music. To use existing music is too comfortable. I believe in the importance of every generation creating their own values. A special complication regarding film music is that there is great value in having a personal expression in the music.