If the lyrics are offensive to God, or enticing to sin, you must not listen to them.
If the music does either too, you must not listen to them.
There apparently is some ‘Christian Metal’ though I don’t know if it is adviseable both because of the music itself, regardless of the lyrics and because a person needs to not rely on music too much for his emotional life. If you listen to music it’s probably best for your health to listen to something sacred or classical, something peaceful.
Porn addiction is a serious problem that takes prayer and work to overcome. God wants to help you to do this. But to do it you *have *to get rid of the porn, and get rid of any near occasions of sin. Near occasions are the things that tempt you and are sure to have you to commit the sin, like magazines, shows, internet sites, etc. where you are tempted because of the way the people dress and act.
You must not sin in your mind or with your body, and love purity instead.
All sins of lust are serious sins, you *have *to overcome them. They can cause you to lose God forever.
The good news is God loves you and it can be done. You can win the fight and overcome the temptation.

And a life without it is a happier life, though the road to that happier life can be difficult, He is there to help you.