In The Red Hand Files, Nick Cave has this advice for a “blocked” songwriter:
My advice to you is to change your basic relationship to songwriting. You are not the ‘Great Creator’ of your songs, you are simply their servant, and the songs will come to you when you have adequately prepared yourself to receive them. They are not inside you, unable to get out; rather, they are outside of you, unable to get in. Songs, in my experience, are attracted to an open, playful and motivated mind. Throw my song away – it isn’t that good anyway – sit down, prepare yourself and write your own damn song. You are a songwriter. You have the entire world to save and very little time to do it. The song will find its way to you. If you don’t write it, someone else will. Is that what you want? If not, get to it.
Human Ties 