[aeadio]

From just the first paragraph, it reads like they aren't trying to approve the release of those songs -- which they wouldn't have the authority to do. They are monitoring his activities as a condition of his parole, which is pretty routine. In this case they're putting forward the argument that he's intent on actively promoting violence with his music, and they are only willing to release him on parole if he curtails that behavior.

I don't know this rapper's music, but this line of reasoning honestly doesn't seem out of the ordinary.

[blinded]

The point there being he might not write something because he knows they will read and dis approve. Its way to control his speech (and this his actions) because is prior actions mirrored his rap lyrics.

If you support stopping this individuals right to speech do you also support doing the same for artists that haven't broken the law or are on parole?