Beatles broke up in 1970, post Abbey Road
/end thread.
Seriously though, there has been a lot of good music post 1976, and there has been a lot of dreck as well. And there was a fair degree of dreck before then as well, but there wasn't as much.
Then came disco. Disco sucks. Sucked then, sucks now, always will suck. Fortunately I found Twisted Sister (at Speaks, then at the original Hammerheads in Levittown) and my soul was saved. There's been some good stuff since then, but will they still be playing it in 40 years like the Beatles, Stones, etc. are?
Answer: Probably yes because the demographic that grew up on it will have aged into their prime earning years and the market will be skewed to them instead of those who grew up on the tunes of the 60's and 70's. Which leads to the scary thought of Black Dog being played on the easy listening station....
But disco still sucks. (This coming from somebody who had a bumper sticker that said "Support live music. Nuke a disco" and who thought "Disco Inferno" was about a disco burning to the ground.)
Did I mention that disco was a plight upon the land worse than the plague? 
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