The problem with that, too, is why do older people matter more as far as having to know someone?
Think if this way: ask 100 people under 30 who Beyonce, Justin Beiber or Taylor Swift are, and most or all will have at least heard of them. Then ask the same people if they know who Led Zeppelin, Eric Clapton or The Who, and you will probably get a lot of blank stares.
This is why I no longer think Stairway to Heaven is the most popular rock song ever, like it was considered for many years. The opinions of younger folks, like it or not, are a factor here when talking about widespread appeal and popularity, and I feel that songs like Bohemian Rhapsody and Don't Stop Believin' have both surpassed it as far as popularity across all ages go. My niece (who is 14) and nephew (who is 16) both know both of those songs, and I am pretty sure they have no clue who Led Zeppelin is or what Stairway to Heaven is.
For sure. Bohemian Rhapsody is the new Rhapsody in Blue, but like RIB, it will be less known among young people as time goes on. It will be like RIB or Beethoven's 5th Symphony, where most people will be able to identify one small part but not know the whole piece or even the name of it. Most kids don't even know who Zeppelin is, but they might have heard of Greta Van Fleet. Forget Hendrix, Cream, ELP, etc... The Beatles are the only rock band most teens will have heard of by the time they're 18 or 20, but almost none would be able to name you or sing you a song of theirs. Rock music, which includes metal, is becoming that music that 'sounds old' like Frank Sinatra and smokey jazz from 80-100 years ago. Newer rock music is not "what everyone else is listening to", which is rap, club music, or [insert pop singer] and a lot of this rock stuff is all over commercials, movies, etc.. Kids aren't listening to some song they heard in a car commercial. Rock was just the pop music the olds were complaining about yesteryear, and now things have come full circle. Sure, some rock got more artsy, progressive perhaps, but overall thousands of rock songs will be long forgotten, and besides the Fab Four, and some of the early rock innovators, assuming the music will even be available to the public in the future, only a few true pioneers will still be extensively studied for centuries to come, I'm thinking guys like Frank Zappa, Miles Davis, even James Brown, dudes who were transcending rock music and other music of their time, who appeal to a wide range of music listeners, young and old, who only come around once in 100 years.