1. Copyright issue: The copyright of musical works will be infringed, such as unauthorized cover, piracy, etc., which will lead to the removal of musical works.

2. Legal issues: Some music works will involve some legal issues, which will infringe others' privacy and social morality, and will also lead to music works being taken off the shelves.

3. Content: The content of some music works will cause controversy and discomfort, including violence, pornography, discrimination, etc., and will also lead to the music works being taken off the shelf.