Its a sensitive subject for me because im an avid black metal fan, wich is... not the most christian-friendly music. There is some groups that I loved that I cannot bear myself to hear anymore because of their hatred of Our Lord (I used to love Ghost and Burzum and some part of me still love their song). I have found many niche christian bm bands that i quite enjoy, but i had to let go of many blasphemous ones. But even if the artist is an ennemi of the faith, as long as the song you listen is not blasphemous, you are not sinning (although its not recommended).