second thought, when have we ever heard a 1979 TV theme medley like that? It was 12-15 themes at least. That alone makes this a set o'week candidate in my book.
I tried to count during the replay--it was somewhere over 20. But some of those shows must have been on their last legs in '79--The Jeffersons? Alice? One Day at at Time? All of those were running when I was in high school--how much longer did they last?
Actually I just looked--all started in '75 or '76 and all ended in '85. So they still had a good run to go in '79.