Hanging around with other Goths could be dangerous to

1 Cor 15:33
Do not be deceived: "Evil company corrupts good habits."

As to the music - is the lyrical content.....

Good, noble, lovely, pure, excellent, praiseworthy? Philippians 4:8

If you are a Christian and have been 'called out of darkness and into His marvellous light' why would you want to enter back in to dark things?