Mine isn't as expanded, seeing as I'm still a teen.
It started off from System of a Down, up to Metallica, and now, as you can obviously guess, CoB. I'm getting into Pantera recently as well.
I did not notice your signature initially and I was thinking, "CoB? Uh. . . Call of Booty?"
My taste started not with metal, but with rock. Or more specifically, Power Pop. Think, Blink 182, Sum 41, the Offspring, and I expanded into Ska with bands like Goldfinger, Less Than Jake and Save Ferris.
I was always searching for something better, something melodic, something musical that I had never experienced. Rock was all I knew, and as good as it was, it really was musically BARREN compared to metal, a genre to which I had never listened.
One day I was on AOL Instant Messenger, and in search of music like typical, I was talking to a guy, saying, "Hey, what type of music do you listen to when you wanna get fired up? What makes your blood pump and makes you ready to tackle mountains into the ocean?"
He sent me this: "Dragonforce - Through the Fire and Flames."
I started listening.
"Uh, this is-- pretty awesome, are there words?"
Up to this point, lyrics started almost instantly in songs I listened to, so ten seconds in, and I was uncertain.
"Yeah, there are lyrics."
I listen.
On a cold winter morning, in a time before the light. In flames of death's eternal rain we rise toward the fight.
Me:
Music like this-- exists?
"Send-- do they have more? SEND ME MORE OF THIS! This is amazing!"
So he sends me a few more, and THUS began my journey into power metal, with minor sub-genre forays.
Now my folder is FILLED with Dragonforce, Twilightning, Solar Fragment, Blind Guardian, Sonata Arctica, Stratovarius, Skiltron, Primal Fear, Dream Evil, Dragon Guardian, Dragonland, Dungeon and more.
Bands like Sabaton, In This Moment, Mechanical Poet and Machinae Supremacy are not exactly power metal, but they're melodic and metal, so they're in.
Initially, as long as it was melodic, I was good. Then I became appreciate of guitar solos (thanks to Dragonforce) and complex musical arrangements (thanks to Aquaria).
Now, if a note plays more than twice in a song, it's too dull for me. I'm still totally into POWER METAL, but rather than my taste in genre changing, my taste in quality and technicality changed.
Now, the super layered, melodic music of Blind Guardian's latest albums (Night at the Opera, Sacred Worlds) and the always moving and shifting and melodic music of Pathfinder are my favorite to listen.
That is where I am now. Give me Angra! Rhapsody of Fire! The more it sounds like a film score mixed with metal and opera, the better. (Double bass THUNDER never hurts, either!)