"One thing that you can never let happen to you is to become more of a critic than you are a writer, where you actually choke yourself off. I tend to get that way. The guys in the Eagles tend to get that way, Paul Simon does, where the critic in you stops everything. Finish some stuff. You know, you look at some of the Bach inventions, well Bach finished everything. Sometimes it’ll be just like no kind of idea at all, but he’ll go right to the end and something will happen. Finish your stuff."
Interview excerpt taken from http://performingsongwriter.com/randy-newman-songs/