I feel ripped off. I caught the tale end of classic rock but had to bear the brunt of Disco and the terrible wasteland of 80s music. If you never lived through it, then the survivorship has taken some of the sting out of it, but even that proves the point. the 80's canon that survives is clearly an order of magnitude worse than any other decade's surviving canon.
For Pete's sake, my highschool sr. class song was "The Power of Love" or some other Huey Lewis abomination.
There was some good music made in the 80s but in stark contrast to every other decade, none of it, and I mean none, ever made the airwaves.
But in answer to the original question 70s, Post 2000, 80s (nothing from the 80s that got any radio play, though), 90s (all in all also a pretty bad musical decade; higher floor than the 80s, bus also lower ceiling, but at least a good bit of the worthwhile music got airplay).