check the lyrics of every tune. metallica may be serving the devil, i don't know. back in 1990, i wasn't a Christian until 2 years later, i threw out all my records that i knew were on the evil side. once, i saw acdc playing to an outdoor crowd at a huge stadium & i saw the devil's horns up top each speaker column!! that did it for me, no more acdc. plus, other bands, i won't listen too. sometimes i'll check out a band that's metal or hard rock just to listen to the extreme virtuosity & talent of the musicians. remember that the devil was the boss of music & he uses music super big time to sway people.