My point being that I have tried to listen to the Jack Benny Program in order. I started in 1937 and got to 1940. 1937 were the first years of Phil Harris and then Dennis Day came along in the 1940's. Interesting radio. But not funny radio.
There was a system the show used during that time that changed by the time the mid 1940's came. I've gone back to listening to the show (after a few month absence) and while Dennis is in the Navy and sorely missed, the show seems to have taken on a new life. No longer hinged to the - what I've always thought - was a stupid, not-so-funny "play" put on by the cast of the show near the end of the broadcast. I'm not sure when this stopped, but certainly, sometimes between 1940 and 1944.