You're making the same arguments over and over again.
Let me try and respond without bringing the subjective part into the debate.
1. Music can convey a message without having lyrics. (I believe true)
a. However, the medium is not 100% of the message. (you say it is 100%)
Let me illustrate. You have a classical song by Chopin(a personal favorite), which is relaxing, and an instrumental song by a death metal band, which is energizing.
From your logic, the death metal song would actually be worse than the Chopin song, and it would be fine to listen to Chopin.
Ok, great, let's take that in a different context. I have a classical song with lyrics like this "Oh hail Satan, etc, etc". Is that song perfectly fine to listen to? according to your logic, that "the medium is the message", it would be fine to listen to that song, since classical has a relaxing effect, unlike death metal, which is more aggressive music.
Obviously, you would have a problem with that song, and thus by counterexample, the medium is NOT the message.
If this was mathematics, I would have just made a slam dunk proof, just so you know.
2. Music is subjective.
a. Several of you have said that you cannot understand the lyrics...while that may be true, I can understand them, and many other fellow listeners can understand them as well, so any point you have about that is subjective and therefore invalid to apply generally.
b. People have been making the point that how you feel while listening to the song, can actually be holy, or evil. I strongly disagree. If I listen to a song that brings forth anger, and is energizing, then it is 100% up to me, how I channel that anger. If I am channeling it towards something not evil(i.e., hating satan, remembering to witness because people are going to hell, etc., etc.), then how is that in any way, bad? It's not.
Think of this...you're listening to what you think is a benign, christian song. They lyrics are great, stuff like "Oh I will serve you Lord, I love you with all my heart", and so on. At the end of the song, the singer closes with the line "And so lord of light, I end my worship", or something similar. To you, that means Jesus, but to someone else, that could mean Lucifer. Where are you now? You have a song that to you, is holy, with holy lyrics, but could in fact be a ballad to satan. For all you know, the singer who made the song, could secretly be a satanist, putting subtle references in his songs.
It's all about where you draw the line guys. With your logic, you could extend it like that, and come up with some outrageous conclusions. "Oh, I can't go play paintball, because it energizes me and makes me want to do violent things...". See what I mean?
So, if you don't like the music...don't listen to it. Just like I hate country music, and don't listen to it, so you shouldn't listen to death metal, if you don't like it.
It's a preference. What appeals to you, might not appeal to me, and vice versa.
The music itself is not inherently evil. Alright, the music itself might be inherently aggressive, but that is no indication that the song itself is "satanic". It's up to you, the listener, how you interpret that energy.
P.S., I don't get angry when I listen to this music, I don't know why you guys say you get mad and violent...I don't. Maybe if I was working out, it would make me work out harder. But just sitting here at the computer...I could switch from Chopin to death metal in a heartbeat and not have a change of mind. (And I actually do do that).