Question: When you've written down your first thoughts and impulses of a song when inspiration hits you, then the "well" of inspiration has ran dry, when you come back to the unfinished song later how do you finish it?
the first thing is to figure out if that piece is the beginning or not the beginning. If it's the beginning, then, run through it and see if you know what comes next. if it's not the beginning then you're kinda fucked. It's almost impossible to figure out what should come before, but maybe if you can get what's next then soon it may want to come full circle. then somewhere around the circle has got to be the starting point