There's a song from 1915 with a 10-year copyright - Apparently.
The song "Alexander's Ragtime Band" by Irving Berlin, released in 1915, holds a unique distinction. Its copyright was set to expire in 1925, but the U.S. Copyright Act of 1911, which allowed for a 28-year copyright term, was amended in 1926 to extend the term to 56 years. However, the song's copyright was inadvertently not renewed, leaving it in the public domain. The song's public domain status was only officially recognized in 1977, when the copyright expired as per the new U.S. Copyright Act of 1976.