What is "good" music?

False, there have always been laws on music and always will be. If we all died and life suddenly sprang to life again they would find the same basic musical notes pleasant then as they do now. Sound is a law.

Gravity is the acceleration of mass towards other mass, according to precise calculations.

Now try to define music PRECISELY. What's the law behind it. And don't go like "It's there, but you can't see it", that's the same crap all religions use (And please, don't bring that into subject, nobody, we don't need to derail this).