My dad brought me to see two of his favorite bands Deep Purple and ELP in 1998, when I was 14. This band that was unknown to us, Dream Theater, was opening. I remember thinking they were pretty good, and having a moment with my Dad during Peruvian Skies (as they started quoting Pink Floyd, he got all excited and was like "This is FLOYD!," then they quoted Sandman and I got all excited and was like like "This is METALLICA!!"). I also remember him saying that Hollow Years sounded like it was their Lucky Man. After the show, though, I was pretty much impressed with ELP that I got their Hits album and listened to not much else (other than Metallica).
In any event, a year later I saw the brand new Dream Theater album in the store (Scenes), and remember looking at it, thinking "I can't get this, I don't even know any songs by this band!" Regretfully, I put it back and didn't think about DT for years. Then around the time St. Anger came out, and Napster was a pretty big deal, I remember wanting something more/different since my favorite band wasn't doing it anymore. So I went to a buddy's house and downloaded The Spirit Carries On and Voices to hear if I'd be interested in picking up some DT. I thought both were pretty good and the next day went to pickup the album I should have 4 years prior.
Popped it in the CD player in the car. Regression comes on, and I can hear the melody from Spirit, which I thought was so cool! Then Overture 1928 starts... and it clicks.
That was the moment DT became my favorite band.