So you figure out the next part of the song based on what's happened, but there are also prescriptions in place (maybe in your case, not using "home" or "dreams" as much, maybe generally topics that kinda off limits for one reason or another, existing popular melodies, etc.). The thing is those are contradicting effects, wouldn't you say? Wouldn't that have to mean that for any song to be done, there are several things that could work at any one point, and the writer just finds one of them? Otherwise a song would never go right
surely there are always multiple answers. there are likely infinite answers