This site applies only to the use of Public Domain works in the United States. Other countries have different laws about the Public Domain.
DEFINITION OF PUBLIC DOMAIN (PD)
WHAT DOES PUBLIC DOMAIN MEAN, EXACTLY?
“The total absence of copyright protection”
“‘Public Domain’ (PD, for short) means that particular works — music, literature, films, TV shows, photographs, works of art, cartoons — are no longer protected by the copyright law. In other words, they are no longer owned by anyone. You can change them — rewrite words or melodies, use Public Domain art as part of your designs — use them in any way you wish. No permission is required from anyone or any company. No fee needs to be paid.”
“The Public Domain is an intellectual property designation for the range of content that is not owned or controlled by anyone. These materials are ‘public property,’ and available for anyone to use freely for any propose. ...” en.wikipedia.org/wiki/Public_domain
“The phrase ‘public domain’ is a copyright term referring to works that belong to the public.”
Note: Laws about Public Domain vary from country to country.
Take Me Out to the Ball Game (PD music), Rockin' Robin (PD music)