The musical style is used to express rebellion and carnality.
You're trying to compare apples to oranges, Car's are amoral.
Music is not.
You missed my point entirely, then.
If rock was made solely for that purpose, then that's all it would be able to express. I provided proof positive that this isn't the case. I could easily give many more examples than I did.
Going back to the car example: Cars are amoral because they are demonstrably useful for both
good and
bad.
So I suppose my argument regarding specific styles of music is this:
rock is amoral because it is demonstrably useful for both good and bad.
Secondly:
You can express anger and rebellion on
virtually any instrument. I can express anger on the piano. I've done it. It's a good way to vent.
My piano teacher sometimes instructs me specifically to play "angry music" for various reasons--to build up strength in my fingers, to gain better control over dynamics (playing loudly vs playing softly), and to practice using the music to emulate emotion.
It's done by playing the notes in a specific way, and playing the notes angrily usually involves hitting the keys harder than normal. (Could also involve playing the notes in a staccato fashion, as opposed to playing them where they connect and harmonize.) Also using notes down near the bass seems to help in my experience, since they are deeper and just sound angrier to me.
Now, let's say I am angry at my parents for some petty reason. (Just for the sake of argument. I'm not a teenager anymore and I've since learned better.) Let's say it's time to do piano practice. Let's say I channel my anger and attitude of rebellion towards my parents into my piano practice.
Such a thing is possible. The piano is an instrument that makes music. It does whatever I tell it to do. Whatever music I produce on it is not automatically moral simply because it's a traditional instrument--or even because I am using steady "1, 2, 3, 4" timing. If I wanted I could write a song or composition on it about how stupid my parents are and how they should just let me do what I want.
(Hehe, actually as a little kid I remember playing a "song" on a toy piano that I'd usually play right after being spanked and I'd spend a little while stewing in anger. I simply played all of the keys in order and the lyrics went "I hate you". Of course, I never said them out loud.)
Classical music often expresses anger. Many of the composers were
not people whose lives we'd commend. For example, it is said that Beethoven died shaking his fist at God.
He channelled a lot of emotions through his compositions--including anger. Possibly rebellion, too.
One piece of classical music is titled "Wine, Women, and Song"--is that not carnal? Is it bad that I like that piece for it's melody?
Basically, people are most likely going to use whatever music is popular to express their immorality.
How familiar are you with music theory and instruments? Some of what I'm trying to explain may be harder to explain if you aren't familiar with either.