I believe that it's NOT "all good," that there is good music and bad music . . . well, good and not-so-good, anyway. That's what Satchmo said, and he was almost always right...

What I could assert with more confidnce is that all kinds of music can be "good." No genre has an exclusive claim on quality. Within any category or subcategory of musical style, there are examples of good, inspired, well-played music, and also of worthless noise.

Bad music can be the result of cynical pandering to the perceived taste of an audience, I suppose. Often enough, it's just a matter of too much ego vs. not enough intelligence and skill.