Someone once asked me in a public forum, whether I waited for inspiration. My answer was: “Every day!” But that does not, by any means, imply a passive waiting around for the divine afflatus. That is exactly what separates the professional from the dilettante. The professional composer can sit down day after day and turn out some kind of music. On some days it will inevitably be better than others but the primary fact is the ability to compose. Inspiration is often only a by-product.
Aaron Copland
What to Listen for in Music