How to apply for a patent for your own song?

You can't apply for a patent for writing songs. These songs are protected by copyright law. Automatically enjoy copyright after song creation; If others infringe your copyright, you can ask them to bear the tort liability. If you think it is necessary, you can also apply to the relevant copyright registration authority for copyright registration and protection; When the right is damaged, the copyright registration record can be used as direct evidence that you enjoy the copyright.