Another famous example is Picasso. Sometimes considered the greatest painter to have ever lived, he was incredibly inventive and broke basically every "rule" in the book. However, if you look at his really early pieces -- he was a fantastic classical painter. He didn't start by breaking the rules, he started by mastering them.
The same can be said for many professions, certainly my own (programming) you should learn the basics and best practices before you can know when it is okay to break them. And like singing or painting it can come down to personal preference whether the rule breaking works or not.
Did I just equate my work to Picasso? . . . I think I did!
I don't think you need to master the rules before you can break them, you certainly need to be aware of the rules though! How else would you even know you are breaking them?
By "The Rules" I think we mean an accumulation of techniques and practices developed and refined by many people over time because they have proved useful. If one has any interest at all in the ones art one will surely be aware of its history and of what others have done. How else does one become interested in the first place? In this respect some awareness of this heritage seems to me to be unavoidable.
It doesn't necessarily have to go back centuries, though. If you're doing rock, you might be intimately familiar with the past 50 years of rock, punk, metal, post-punk, grunge, etc., without having a clue about opera.
The things I write are always more interesting when I follow a simple structure (sometimes one I've used for a long time, sometimes one made for the occasion). The "creative" brain dump stuff is always wandering, unclear, and a couple thousand words longer.
Creativity always happens when I'm editing what filled the structure. The basic rules I lay down in advance make sure I get to that point.
And to bring this back to visual arts, it's rare to find a good artist who doesn't study references and do thumbnails.