It helps to create innovative ideas in your songs. Don't place limits on your own ideas or trash anything. I disagree with the theory that you should only work on one song at a time, simply because I've become more prolific by working on multiple songs simultaneously. By having more than one idea open, it lets your mind created new and different ideas more freely. You make your own inpiration and it usually comes from perspiration.
Songs are a snapshot-one moment, a single emotion.
That's when they are the most powerful. We only knew him through e-mail. The whole thing completely backfired when we stopped hearing from this guy, who now holds one of our songs in his possession to do whatever he wants to with it, although it is unofficially copyrighted. While the net is wonderfully open place, it's also a very easy place for predators to hide. I think you should wait until you're inspired for each and every song.