Reduce your work to tangible form: record a song, for example, or write down a story. As long as your work is original, it is entitled to copyright protection even if it is never published.
Navigate to Form CO on the website of the U.S. Copyright Office (please see Reference 1). You can complete this form online.
Complete Form CO. You must provide the title of the work, the type of work, the publication details (if it has been published) and the year of completion. You must also provide the full name of the author, the author's years of birth and death (if applicable), and the name and contact details of the copyright claimant if the claimant is not the author. You must also provide contact details that will allow people to request permission to use your work.
Send Form CO, a digital copy of your work and a filing fee, $35 as of publication date, per work to the U.S. Copyright Office. You may also file your application by surface mail for a fee of $50 at publication date per work. The Copyright Office will mail you a copyright certificate.