Musical composers convert their ideas into lines and dots. They get to see those ideas preserved and then reconstituted by others. The composer can only include technical information—performance data. The musician reads that data, and then, by dipping into a wellspring of common human spirit, is able to put the "soul" back into the piece. The music will naturally be colored by the performer's individual style, and some of the composer's individuality will be lost, but the composition inspires both musicians and audiences long after the composer has passed on.
Writing is a similar process. Thoughts, ideas, and experiences are encoded into little squiggles on a page or a screen. Readers recompile your words into something much more powerful than sequences of facts. When the reader is inspired to dip into that wellspring of essential human spirit, written composition is as powerful as musical composition.
Writing is a process by which we get closer to the mystery, and by which we bring our readers closer to the mystery. That's the best thing about being a writer.