What is "good" music?

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).

Music is sound. Sounds are innately good or bad. We can learn to tolerate certain sounds but that doesn't make them good. Just as we can learn to tolerate pain or even enjoy pain, but that doesn't make getting hurt a good thing.

Scratching nails on a chalk board will hurt your ears.
Bashing on a keyboard will annoy or irritate you.
These things are universal truths.