Music that has passed the copyright period can be used at will. Logically speaking, the music platform will not charge any more. If it is some particularly classic music, the music platform may charge itself, but this is the same as the copyright holder. It's irrelevant, but the author's name needs to be announced

The validity period of copyright is also relatively long, and the right of authorship is permanent. Some other powers expire fifty years after the author's death. Therefore, there should be very few works that will actually experience copyright expiration