Okay, this is going to sound really nerdy, but I've always found this quotation from Anne Rice's Vampire Chronicles very insightful regarding rock music in general (though it seems to apply more to metal than to other rock genres):
"I was enchanted by the world of rock music--the way the singers could scream of good and evil, proclaim themselves angels or devils, and mortals would stand up and cheer. Sometimes they seemed the pure embodiment of madness. And yet it was technologically dazzling, the intricacy of their performance. It was barbaric and cerebral in the way that I don't think the world of ages past had ever seen.
Of course it was metaphor, the raving. None of them believed in angels or devils, no matter how well they assumed their parts. And the players of the old Italian commedia had been just as shocking, as inventive, as lewd.
Yet it was entirely new, the extremes to which they took it, the brutality and the defiance--and the way they were embraced by the world from the very rich to the very poor.
Also there was something vampiric about rock music. It must have sounded supernatural even to those who don't believe in the supernatural. I mean the way the electricity would stretch a single note forever; the way harmony could be layered upon harmony until you felt yourself dissolving in the sound. So eloquent of dread it was, this music. The world just didn't have it in any form before."
--The Vampire Lestat
To me, metal is the language of excitement. Nothing else gets my mind closer to the sensations of danger, power, and awe. ...Of course, I've never tried any hallucinogens or hard drugs, but I think it says something that metal is as 'intoxicating' as it is without actually directly interacting with your brain.
I can't say music ever really helps me in solving life's mysteries or answering profound questions. It can, however, put me in certain states of mind where I notice subtle, hidden meanings in life, or where I feel in touch with my past, or become more sensitive to my place in the universe. Music's a good way of accessing very specific emotions and thought patterns which are otherwise hard to achieve.
If you think about it, it seems that dreaming, meditation, drug use, and art (i.e. metal) all kind of serve the same purpose - just various forms of mental 'archaeology'. It's one thing to gain understanding about the world through study, travel, and interaction with others. A lot of the time, though, this information and experience just gets stuffed away in the brain, in a dormant state, only to later be dug up and processed in a way which really makes the bigger picture come out clearer. That's why it's nice to access these various states of mind.
I like how my topic got more and more broad as I went along. Anyway, that's my take on things. Hope someone found it interesting.