Music does not depict the world. It doesn't depict anything. It is a man-made enhancement of our world and of our experience. Its effectiveness, its power, to broaden our experience varies with the expertise, capabilities, and gifts of the people who create it and perform it.
Leonard Bernstein, in a lecture in the late 1950s, adamantly stated and illustrated this point:
MUSIC HAS NO MEANING.
It is what it is. Does it tell a story? No. Bernstein illustrated this by telling an improvised, off-the-cuff sorta science fiction story, and set it to a well-known symphonic piece - I believe it might have been Peter and the Wolf, or maybe Petrushka. The music made a workable accompaniment to his story - but it wasn't the story itself; in fact, as he revealed to his audience, it was intended by its composer to provide the auditory enhancement of a completely different story than Bernstein's sci-fi invention. It worked equally well for both; therefore, it must be an entity unto itself, something apart from any "story."
In my experience, when I have listened to a piece of music that really reaches me in a powerful way, my experience has been unrelated to anything else in my life. When I first became familiar with Stravinsky's Firebird, I had found what was to become one of my lifelong favorite pieces. When I discovered later that the music is sometimes used in a storytelling context, I was disappointed. The music is too powerful to be limited by a utilization of some kind. It stands much more elegantly, and truthfully, as a performance/concert experience, than as some kind of set of aural Crayolas.
The one hole (as I see it) in my viewpoint - I, too, think now and then about the nature of music, since it means so much to all of us - comes up when I think about somebody like, say, Woody Guthrie. Because, something tells me, if he was asked the question What Does Music Mean, he'd probably have had some kind of answer, some kind of Meaning of Music. His music certainly seemed to be drenched with...something like "meaning." And some of it was, of course, damn good music. But, getting back to your question, I kinda feel like Woody was probably astute enough to go with the notion that music is closer to being a "world of its own" (that is, a free-standing entity) than a "representation of the 'real' world." He'd have said, sure, his lyrics had depictions of people, places, events, etc., but maybe he'd allow the idea that his songs' effectiveness in resonating with people listening lay somewhere in their intrinsic musical properties - melodies, guitar chords, etc. Otherwise, he might not have seen any necessity for luggin that guitar around with him...and just been a "poet."