Music rights are super complex. Even royalty free and “copyright free” music often come with limitations on how it can be used. And we are actively exploring ways to bring more music to the ecosystem. For now, the safest path is to use music your own original music - either that you’ve created or that you own all the rights to. If you’re using your own original music and your island is still getting rejected because of it, please surface that through player support so we can address it.