Which is more important, grammar or content?
The content of a written piece is important; it is, after all, the reason you are writing said piece. Eloquence is a large part of writing, though. No one enjoys struggling through a badly written article. Having correct grammar and stating thoughts clearly facilitate the reading experience and make it more likely for the reader to be engaged and appreciate the piece as a whole.
What is the point of music theory?
Music theory is all the background information you need to understand how music works. It is helpful in learning new music & creating new music. It challenges you mentally and creates an understanding to how much is actually going on in a single piece of music.
What is the key to successfully performing music?
The key to musical success is dedication. No instrument can be mastered, no piece memorized without the due diligence to learn it. Having an in-depth understanding of the way music functions (music theory) can assist you in completing the whole picture when looking at a piece of music.