But that’s part of the process, isn’t it? Something might not fit in the show. Musicals are — particularly musicals — plays also, but musicals particularly are… the last collaborator is your audience, and so you’ve got to wait ’til the last collaborator comes in before you can complete the collaboration. And when the audience comes in, it changes the temperature of what you’ve written. Things that seem to work well — work in a sense of carry the story forward and be integral to the piece — suddenly become a little less relevant or a little less functional or a little overlong or a little overweight or a little whatever. And so you start reshaping from an audience.
Recorded Academy of Achievement interview, 2005 source ↗