Re:All sound recordings prior to 1923 will enter the US publ...
by bryanlarsen on Tuesday December 07, 2021 @12:02PM
(#29475069)
But if your copyright has expired, you can still prevent derivative works via trademark. Disney has trademarked Mickey Mouse.
(See 17 USC §106 (https://www.law.cornell.edu/uscode/text/17/106) for the full list of what copyright actually protects.)