Peaches because it was just so cool, so long, and that awesome guitar solo. It was rock music, but nobody sings; it was chamber music, but theres a drum set and an electric guitar solo; it totally blew my mind.
Electric Guitar Phase was the first time I had every heard anything related to minimalism. For those not familiar with the piece, it is a distorted guitar riff (originally a violin) played constantly, then a second guitar playing the same riff enters, and slowly phases (moving forward or backward one eighth note at a time) in and out with the first guitar. Then a third guitar enters, then a fourth. All playing this same riff, all phasing with each other. For 22 minutes. The first time I heard it I had to hear it again. It was glorious.
I have since gobbled up all the Zappa and Reich I possibly can, read their books, played their music, and been to concerts of their works.
I love Zappa's work ethic and unique perspective on all things, I love Reich's experiments with tape and voice and layering. Just the mind wanting to experiment and discover and look what happened!
So really you can blame it all on them.