Guys, let's talk Scripture.
Matthew 12:30 He that is not with me is against me; and he that gathereth not with me scattereth abroad.
If you are not with Jesus, you are against Him. It doesn't matter where else you try to stand, because if it's not on the Solid Rock you are in peril. Musicians who have not the spirit of God have the spirit of man, or the devil. Man is in subjugation to Satan, because he decided to obey Satan rather than God (Genesis 3) and therefore is fallen and evil in nature.
Isaiah 64:6 But we are all as an unclean thing, and all our righteousnesses are as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away.
Knowing (and believing) these basic facts of reality we can then discern that music that is not Godly music is, well, ungodly. Evil. Not profitable. Stubble that will be burned away. It's not the genre of the music that is bad, it's the spirit behind it (remember that earlier post with the video about Amos 5?)
Now you might be thinking, "I can listen to whatever Satanic thing I want, because Jesus died for that!"
Romans 6 begins What shall we say then? Shall we continue in sin, that grace may abound? God forbid. How shall we, that are dead to sin, live any longer therein? (I suggest reading the whole chapter)
We are not under the law's penalty because we are saved by grace through faith. This does not mean we have an excuse to do anything. What it does mean is that if we screw up we have the power, through Christ, to repent of our sins and He will surly forgive us if we ask.
1 Corinthians 6:12 All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any.
Can you listen to inherently evil music and not instantly be condemned to Hell fire? Absolutely, don't let someone tell you otherwise, BUT it's still not good or profitable. In 1 Corinthians 8 we learn that we can potentially stumble another believer with our actions in our freedom. Like if a believer who's weak in the faith, who was formerly an alcoholic came to your house and you were drinking a beer, that might trigger him to stumble and say, "Well I can do that too!" and off to the bar he goes, yeah?
1 Corithians 8:12 and 13 But when ye sin so against the brethren, and wound their weak conscience, ye sin against Christ. Wherefore, if meat make my brother to offend, I will eat no flesh while the world standeth, lest I make my brother to offend.
What this really all boils down to after learning all this and applying it is that it comes down to personal convictions that God has given us individually. We need to be mindful of other members of the body and their convictions, but we should never be pushing our personal convictions on others. Our personal convictions do not save people, Jesus saves people.
1 Corinthians 10:31-33 Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God. Give none offence, neither to the Jews, nor to the Gentiles, nor to the church of God: Even as I please all men in all things, not seeking mine own profit, but the profit of many, that they may be saved.