Music page 21

I'm happy to help! However, I need more context about what you mean by "music page 21". Could you please provide more information or clarify what you are referring to?

Are you looking for:

• A specific song or artist on page 21 of a music playlist or album?
• A music theory or notation page 21 from a book or sheet music?
• A music-related article or blog post on page 21 of a website or publication?
• Something else entirely?

Please provide more context or clarify your question, and I'll do my best to assist you!