"Fill the time?" Well yes, there is dialogue. (If one feels that the function of dialogue is to "fill the time" between songs lol.) It's not a sung-through show. It is a one-act, so 9 songs feels about right. There's a section at the end that wasn't recorded.
Also, the pre-show music is priceless. I wish they had included some of that on the recording, but then again, it might have felt out of place. ;-)