First, it was mainstream pop music, then I found Linkin Park, there on I was just stuck in rock/metal/heavy/mainstream music.
I believe that the thing that first got me into electronic was Hybrid, there was this track called "Unfinished Symphony" and I looked it up and found hybrid.
But the thing that got me into psy was actually "Mona Lisa Overdrive" on the highway scene from Matrix Reloaded. I loved the sound and looked the Matrix Reloaded OST up and learned that it was by Juno Reactor. Time passed by and I somehow ended up typing Juno on last.fm and then I found Astrix, 1200micrograms, hallucinogen etc. and I was almost hooked on psy but it was quite there yet. I hadn't really found anything "OMAGAWD"-worthy stuff.
What sealed the deal that I was completely hooked on Goa/Psy was Filteria - Sky Input. I don't remember how I found it, but I just did and when I booted up Operation Pulse for the first time, a ton of shivers/chills went down my spine, that happened to me with every single track on the album and then I knew... then I knew, that I was in... love..