Music page 18

I'm happy to help! However, I need more context about what you mean by "music page 18". Are you referring to:

1. A specific music theory book or textbook with a page number 18?
2. A music sheet or score with a page number 18?
3. A music-related article or blog post with a page number 18?
4. Something else entirely?

Please provide more information or clarify what you mean by "music page 18", and I'll do my best to assist you!