There are few creative acts more mysterious and magical than writing a song. But what if the goal wasn't so mysterious and was actually achievable for anyone who wants to experience more magic and creativity in their life? That's something that anyone will be inspired to do after reading Jeff Tweedy's How to Write One Song.

Why one song? Because the difference between one song and many songs isn't a cute semantic trick-it's an important distinction that can simplify a notoriously...