Rachmaninoff 's music was in the public domain in the United States .
Carmen thought no copyright existed on it , but music was still protected outside the United States Subsequent to the release of the album , he was contacted by the Rachmaninoff estate and informed otherwise .
Rachmaninoff 's music was in the public domain in the United States and Carmen thought no copyright existed on it , but it was still protected outside the U.S. Subsequent to the release of the album , he was contacted by the Rachmaninoff estate and informed otherwise .