What is the context of following part?

This is the part of The Death

He stood still in the gloom of the hall, trying to catch the air that the voice was singing and gazing up at his wife. There was grace and mystery in her attitude as if she were a symbol of something. He asked himself what is a woman standing on the stairs in the shadow, listening to distant music, a symbol of. If he were a painter he would paint her in that attitude. Her blue felt hat would show off the bronze of her hair against the darkness and the dark panels of her skirt would show off the light ones. Distant Music he would call the picture if he were a painter.