How to Copyright music?

Please be aware that the US Copyright Office's current position on Artificial Intelligence is that human authorship is required. What this means is that while the Copyright Office will accept works in which you have used AI as a tool, it will not accept works where AI has created the expressive content. In other words, if you have written your own music and instructed AI to modify the music in some way, that is likely registrable. If instead you provided some textual prompt to the AI and had it generate music based solely on your instructions, then that is likely not registrable. Obviously there is a complicated gray area in between those, but to the extent that your creative contributions cannot be separted from those of the AI, the work will be ineligible for registration.   Please also be aware that there are two types of music copyrights available. The "musical work" covers the song's composition and lyrics, usually created by a songwriter or composer. The "sound recording" is the actual recorded song, usually created by the performer or the producer. In either case, you would need to specify in the copyright registration application the portions of the work that you created yourself that are original to you, and the portions that you did not create. As mentioned above, to the extent that the AI tool generated the "music" (either the composition or the actual sound), you would not be able to claim authorship.