iTunes has a 2-hour "Original Broadway Cast Recording" of Galt MacDermot's The Human Comedy.
I know nothing about this show.
I never heard of it either, so I looked it up on Google. Wikipedia says it's his last Broadway musical, from 1983. But they did an oratorio-style staging, a sure-fire recipe for Broadway success, right? In that case it may work better as a cast recording than as a semi/non-staged show. If you give it a listen please report back!