broadwayguy2: I was fascinated by your long entry explaining at least in part why sound design today has to be louder than it used to be. I loathe the high amount of amplification in use for most shows today, especially the audio boost at the end of musical numbers, often creating a distorted sound. Examples: Audra McDonald's songs in RAGTIME and Patti LuPone's songs in GYPSY. Here are two strong singers that simply don't need the boost. What a waste!
If you are interested in scenic design you might also consider the heavily illustrated book on Jo Mielziner titled "Mielziner: Master of Modern Stage Design" by Mary C. Henderson. It is very readable and informative.
Speaking of famous songs done "in one", probably the best known one is "There's No Business Like Show Business" from ANNIE GET YOUR GUN. And songs in one, at least in the old days, were not done in front of show curtains which were used only during a show's overture, and were behind the house curtain which was in place when the audience entered the theatre. Songs in one were usually performed in front of a plain traveler curtain.
"Madam Rose...and her daughter...Gypsy!"