Im thinking about in all the ways even streaming now. Im thinking before streaming the stooges would be a good contender. Was shown in movied theaters and had reruns going all the time on so many different channels. Its a wonder life used to be spammed in november and december before the ip was taken back out of public domain.
EDITING. Im thinking more about the same thing being rebroadcast I think which is why I was thinking its a wonderful life to. So like there are only so many stooges and they get replayed a lot as opposed to like the simpsons or doctor who running for a whole bunch of seasons.
I love Lucy used to be on multiple stations multiple times a day. That has to be a contender.
I read that Tusk by Fleetwood Mac was the most played song because every high school and college marching band around the world loves to play it.
I feel like it would need to be some relatively early show that has maintained a degree of popularity. Maybe an early cartoon that was seen as appropriate kid’s programming, like The Flintstones or The Jetsons.