There is a thread of similarities in these openings. It seems to me That Girl begat Mary Tyler Moore which, in turn, begat Doris Day and Rhoda and Phyllis are maybe distant relatives. What do you think?

That Girl
https://www.youtube.com/watch?v=Zoh1LGADKI8

Mary Tyler Moore
https://www.youtube.com/watch?v=JtG3tgarJSc

Doris Day
https://www.youtube.com/watch?v=PBMa9ucXpbo

Rhoda
https://www.youtube.com/watch?v=rgC7mejjqlQ

Phyllis
https://www.youtube.com/watch?v=e8--8V7bVeI