The Copyright Law Act of 1976 defines "works of authorship" to include all of the following:
* Musical works
* Literary works
* Dramatic works
* Pictorial, sculptural and graphics
* Motion Pictures and Audiovisuals
* Sound Recordings
* Choreographic Works and Pantomimes
* An eighth work which falls under "architectural works" was later added in 1990.
What is unique about the United States copyright law is that it is automatic. Once someone has an idea and produces it in tangible form, the creator is the copyright holder and has the authority to enforce his exclusivity to it. In other words, the person is the owner of the creation. It is not necessary that a person register their work. However, it is recommended and it can serve as evidence if someone ever violates a copyright.
Read more: The Copyright Law Act