Mostly, during the course of this book, we've been discussing visually oriented scripting. Yes, we write dialog but—in screenplays, AV (audio visual) presentations, and stage plays—we see our dialog performed as well as hear it.

The audio play script is different, it's meant only to be heard.

Sound, of course, is very important. In a video or film, the old cliché says that "sound is seventy percent of your video." An exaggeration? No, not when you consider its impact. In producing a video, we can often (and I have) get away with poor lighting and less-than-stellar content if we have good sound, including appropriate use of some stirring background music.