The late 60s (and especially 1969) was just a very great time for music, perhaps because the boomers were coming of age, but anyone of any gen can enjoy it. The only time in my life that competes, and even then not anywhere near as much, is the early 90s (incidentally, inspired a lot by the late 60s).
There's a series on Apple TV "1971" which was also a great year. The movie gives just way too much airtime to Sly and the Family Stone and Gil Scott-Heron, though. Not that they weren't important, but there are a whole lot of other groups they don't mention at all.
>Plus you gotta factor in Gen Z's love of all things boomer.