Just Fyi, I'm 15, so keep that in mind when reading. It all started with my parents. They were not musically active, but they had good music choice, which helped me a lot. So I grew up listening to and loving Led Zeppelin, U2, The Beatles, etc. Then, I got an ipod, and listened to this music, but just through ibuds
Then I bought cheapo skullcady on-ears after I saw a friend with them, and I was so impressed with how they sounded with techno(lol)!!! I then got skullcandy earbuds, and skullcandy and sony on-ears, of slightly higher caliber, but also inherited a mid-range speaker system from my grandparents, who got new things, and I inherited ~100 LP's (Classic Rock), but this is when I entered the dubstep phase and I was just looking for the 'best' bass. shortly after this, my dad got some v-moda vibes(at the apple store), and they were so great, I knew I wanted more! My skullcandies all broke soon after that, and my sonys started falling apart, so I started listening more to the "awesome" speakers in my room. I also started looking for better headphones and was simultaneously researching building a comp at overclock.net, and stumbled across this site through them, looked around, and bought my Grado's, and E11 (and turbines for my techno), and am back to the music I wa raised on. So I really am going through the three stages of audiophilia, bass, treble, and then midrange. My wallet hasn't been happy with me though. I am now known by my friends as the "audiophile" even though I just like music enough to care about quality(they think just an iPod plus e11 is a crazy rig, and super high-end haha)
tl;dr: Parents and g-parents are awesome, skullcandy->Grado, sadness->happiness