Wow, I certainly have missed a very lively debate here on the nature of our craft's end result.
I'll put my two cents in the mix here:
For me, music is both an extension of my own personal thoughts/ideas and a continuation of the overall stream of human experience. Let me elaborate on both of these, before the trolls start pouncing.
By personal thoughts/ideas:
My music is structured to convey my own ideas and thoughts. I, like I'm sure others here, do my best to present my ideas and thoughts in an intellectually coherent way. With my harmonic language, which while not out there in totality isn't Common Practice, that requires a great deal of thought and planning. To this end, I think I succeed in creating music that seems logical, natural, organic, and intellectually coherent. It get's what I want to say across and does it in a way that other's can comprehend and appreciate it - or at least I hope.
By overall stream of human experience:
This is where, I'm sure, trolls will pounce. I believe that each of us rests on the shoulders of giants. Our work, at our earliest stages, is built upon and inspired by the work of these giants. Whether it be Mozart, Beethoven, Mahler, Shostakovitch, Schoenberg, or Dittersdorf, we all have started our foundations with aspects taken from the works of these giants. Thus, the same as I. I studied the masters to death. Mozart, Beethoven, Haydn, Handel, and Schubert especially. My foundation was built on things I took from my studies. My own experiences however moved me from their language to embrace the language I now use. Each of us, even those who have yet to experience life, move through experiences and are shaped by them. As artists, that shaping is most profound in the art we create - as has been chronicled by virtually every composer/painter/author since time immortal, lol.
To close in my thoughts on this, it is my belief that if you are serious about your art/craft that you will indeed move through the normal stages of being a composer. You start by studying and finding what it is that speaks to you. You write it - knowing you'll make many mistakes at first. You write it some more and expand on it. You experience life and emulate it through your music. You grow. Everything else outside that circle, all the theories and philosophies and opinions... is mute.