What is "good" music?

I mix up some grays and greens, and some reds and browns.

I can't totally see appreciate the same thing the same way. If what you said were true, you should be able to universally give a song an accurate score on how good it is. If you can't, then you can't say if it's good music or not. Because that's only opinion.

And where I set my standards, was that post I made on the first page. But what about other people's standards?

Perception is not truth. All things follow laws, and those laws are truth. Music must follow those same laws and by following those laws it becomes good. I can't blow into a rusty trumpet and claim the noise it produces is good music because I perceive it to be. I am not qualified to explain exactly what it is that makes good music but I can certainly say that most of what listen to in modern culture doesn't qualify. But even though it may not be technically good it can still be enjoyable.