I don't think you can write a song, except by writing songs. Let me explain.
I can write letters. But unless I have an idea, I cannot write a story. I can sit here and think of many ways to write a story, but unless Im inspired and *I* feel it, chances are, I'm not going to make an interesting story. After all, if it doesn't move me, why would it move you?
The best way to do anything is to start doing it, and hone your craft through what you learn as you go. Although I have a mastery of the guitar in many respects, I do not write a song, unless it "happens" to me, because thats when its at its most authentic. The best way to do that is to put yourself in a mode where you are receptive to inspiration. That inspiration could be a riff you just got, a 2 chord idea youve never played or heard the same way that you are now hearing it etc. The best tool for those who have opened themselves up for being inspired is the portable recorder. Carry it around with you so that on a moments notice you can capture the moment before its gone. For me that is my iPhone. It has a recording function, and Ill take an idea and record it and leave it for a while and see what comes of it. Sometimes it flows, and sometimes it still needs time to cook, and I wont rush it. Id rather not use it than use it in a way that turns out to feel canned contrived and so-so.
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