How often I have found that we grow to maturity not by doing what we like, but by doing what we should. How true it is that not every 'should' is a compulsion, and not every 'like' is a high morality and true freedom.
I find myself improvising a lot. But, sometimes I'll come us with a chorus or just one line and it will sort of hang out for a long time before it get's flushed out into a real living song.