[shakna]

> Either the music is public-domain or permissively licensed and you're fine, or it's not and you're probably not.

If only copyright were actually that simple. The music might be, and the performance not, or vice versa. Maybe the rights were assumed to be public domain, and then a company discovers the rights in their vault. Maybe the license is permissive, but one of the many people involved never agreed to it, and that means that it retroactively isn't licensed permissively.

All of the above have happened before.