This has been on my mind, too, "Signal Songs," and also the down side of it, like you mention, bflat.

I think there's a 'happy medium.' Acknowledge the signal song or whatever you call it, but don't let it boss you or doom you...

I see them as stepping stones, supports along the way. Of course, some people think that we're all just going in circles anyway, so what's to 'overcome.' But, I think most people agree that there's some difference between idiosy and natural repetition.

Then, there's the question, do you believe in angels or other spirits, that are guiding us by using songs (or other works of art)? What actually makes these songs signals, after all?

It's really intriguing, huh?