I suddenly had an inspiration for writing in a novel. I wrote a song. Can I promote it? Can I apply for a patent?

Hello, you can apply for copyright registration separately for the words and music in the song. If you are in Beijing, you can directly go to the copyright registration hall to queue up to apply, or you can choose to entrust an agent to apply. For the reasons and procedures for copyright registration, you can directly check the official website of China Copyright Protection Center.