Slayer,
I have been in your position before, thinking that music and such do not matter 'because that's not what I really meant.' But it does matter. As I grew more in my relationship with the Lord, I grew in the love of the Lord, and realized that more and more that I was deceiving myself into believing that surely it's all harmless (Hosea 4:6 - that is, spiritual knowledge). Boy, I was wrong, and as the Lord revealed more to me about soul ties and deliverance and healing in Him, I realized that it not only effected me and my relationship with the Lord, but also led me to cause others to stumble in their walk too...realizing I was held accountable for their fall (1 Cor. 8:13). That bothered me a lot because it wasn't about just me anymore, but others, and most importantly about how I was hurting the Lord Jesus, the One who died for me...even when I did not know Him yet (1 John 4:19).
You had mentioned how some of the lyrics or names were said, but the people indicated that's not what they really meant. Well, if anything, that causes confusion over others, and it does effect them (whether they understand it or not, but the demons do...they know exactly what they are doing in it, words effect people (James 3:6-9)...they either speak life into someone, or death). Some Scriptures to understand about confusion: 1 Cor. 14:33 (God is not a God of confusion); James 3:16 (according to this Scripture, there's envy and strife there also, in that 'talk of confusion'). It is important that one who believes in the Lord examines their heart fully and completely(2 Cor. 13:5), led by the Holy Spirit because a man's heart will deceive himself (Jer. 17:9; 1 Cor. 3:18) (without the Spirit's guidance into what is pure and helpful to someone - what we see as harmless may not be the same in the Lord's eyes because He knows the spiritual implications behind it - Isa. 55:8-9; Jer. 17:10; Ps. 26:2).
One other Scripture that may be useful in tying all this together above: Matt. 15:10-11
Something to go to the Lord in prayer about, and it may be helpful to learn some things about soul ties and deliverance. A couple of books that are great at explaining these topics: "Pigs in the Parlor," by Frank and Ida Hammond and "Breaking Unhealthy Soul Ties," by Bill Banks.
j_sp