I've mentioned it before, but I really like the FM&M D-day episode. Patriotic music and very little dialogue. Also, just listened to a gildersleeve (surprise!) that I had missed somehow...it had breaking news bulletins about the attack on Pearl Harbor. Caught me off guard as I wasn't expecting the "breaking news."
Wow! I have often said that I have learned more about society back then by listening to the commercials and PSA's on OTR than I could from any textbook. There was a FM&M episode that ended something like, we hope to provide a little laughter during this trying week. The week that episode was aired was the first week of September, 1939, when WWII started.
I also get a window into society back then when I hear stuff like Abbott and Costello make references to A coupons, or butter/meat rationing, etc. I heard one commercial for toothpaste at the end of one show which said that people had to turn in a metal toothpaste tube in order to get a new tube of toothpaste!