Some bands to the current date have done an excellent job of iterating upon the most popular and most niche aspects of that most lionised era 1960s-1990s.
And, conversely, some of the most lionised bands during that time also wrote some less good stuff during that time.
There can be something to be said for being the first to do something, being the most proficient to do something, being the most sincere, or being the most knowing (eg postmodernist) to do something. Each of these can happen anytime but it depends on publicity, personality, and being regarded as part of a zeitgeist.
We must accept that we know barely any of the full sum of music being produced. Still, we can compare what is popular in each time. But our enjoyment of it is a bit biased by what we liked when we were about 14.
I think that the mid 80s to mid 00s was a particularly interesting stretch in the mainstream. It covers R.E.M., The Stone Roses and Madchester, The La's, The New Romantics, Kate Bush (although 1980's Never For Ever and 1982's The Dreaming are now my favourite), Tori Amos, 90s Britpop, a resurgence of 1960s-style garage rock (not least The White Stripes) , even a couple of Pink Floyd albums and some diverse work from David Bowie. The 70s was certainly an important time for those latter 2 artists yet, as a society, I feel that the 70s was sometimes an awkward time for the UK, a hopelessly cartoonish divide between NIMBYs clutching metaphorical pearls, cartoonishly raw punks (including the faux youthful rebelliousness and tacky sexualness of the no longer young The Rolling Stones) and the soul-destroying conspicuous excess, like Eurotrash granting the peasants a salacious peek, of the over-lauded Roxy Music. Thank goodness the 80s started to put the worst aspects of the 70s in more order.