>>92255329The compositions are public domain, but the sound recordings might not be. As retarded as it sounds, needing to get perms for (sound recordings of) public domain songs is normal and reasonable.
Here's a sample of what I'm talking about: The Berliner Philharmoniker's 1962 cover (sic) of the 9th Symphony:
https://www.youtube.com/watch?v=QtIo2RSi_YAThe sheet music of the 9th is public domain, so anyone with an orchestra and chorus can play it whenever they want. But the sound of Kajaran's orchestra playing it is NOT public domain, and playing it as your stream BGM can get you DMCA'd.