I'm too old, I can't really remember the first song I heard. Being in Chicago I listened to a lot of house music naturally, and Moby was here at that time.

Before "techno" there was the great label Wax Trax, which was another Chicago staple. Ministry's Work for Love seems about right for the first Wax Trax song I'd heard.

Before all that was synthpop, I think the first synthpop song I heard was Gary Numan's Cars, it was on a Ktel album Rock 80, that I asked my mom to get me for my birthday or for Christmas, lol. I can't remember which.