Just realized there is a group that I hadn't appreciated at first, but do now to the point of becoming a huge fan:
ABBA
There is probably no more boring declaration on earth as to say "I'm a fan of ABBA." But..
They were in the background growing up, didn't pay much attention. Like many in the 90s grabbed their ABBA Gold CD to play on car trips, realized "hey they were actually quite good!"
Then around 2021 when they'd announced their first new album in 40 years, I guess the youtube algorithms were pumping out more ABBA recommendations, and there was a thumbnail for ABBA performing SOS on American Band Stand. I thought "I remember liking that song, but I've never seen ABBA perform, so...click..."
And that was it. First, I instantly fell head over heels for Agnetha Faltskog ("how did I miss this woman when I was growing up??!!), but I was also led down an ABBA video/performance rabbit hole and came to appreciate just how damned great the girls were as vocalists, the incredlbe ear candy the combination of Frida and Agnetha produced, and the actual depth and complexity of their songs and production.
So I've been a huge fan ever since. Their career is pretty astounding in terms of their consistant world wide and generation-spanning appeal. I'd guess that ABBA's Dancing Queen may be one of the best known songs in pop. I have a soft spot for their song SOS which to me is one of the greatest pop songs ever (John Lennon said it was a favorite of his, Pete Townsend said it was the greatest pop song anyone had written up to that time).
Agnetha performing SOS: