Art" and "Anything You Want" are two very brief but very powerful books on the creative process, though they take very divergent paths.
Steven Pressfield's "The War of Art" is a manifesto urging the reader to conquer resistance -- the resistance that prevents us from doing what it is we need to do. At times admonishing and at times metaphysical, this is the kind of book one wants to keep close at hand as a reminder when straying from the task at hand. As an Esquire review put it, Pressfield's book is: "...a kick in the ass."
Conversely, Siver's "Anything You Want" is an abbreviated inside look at Derek Sivers' ten-year adventure as the founder of CD Baby, an early online music business. Sivers, a musician, makes it clear he has the discipline to do what it is he sets out to do and it's a fascinating read. The upshot: be sure that whatever it is you are doing serves the ultimate goal of being happy. He concludes that money and possessions are not as important to him as the freedom to live a more nomadic life -- a very unusual but refreshing conclusion from a "successful" business-owner who made millions from his brainchild.
Both worth a look...