What triggers a song? Where does the seed for it come from and how do you process it?

There's no real answer to that question. Schubert, the composer, said that he didn't ever write anything, he only remembered it, and I think that explains it as much as anything. It's just be there, be there now, be in it. There's nothing you can say about it really, that isn't contrived, so you might as well not say anything, because there is nothing to say. 

Neil Young
i interview med Sylvie Simmons, Mojo nr. 207 februar 2011 (min understregning)