You know the one I am talking about, like in this song ( http://www.youtube.com/watch?v=Dnxr9fWUaXU ), not the main electro instrument making the melody, the background synth going, "dun dun dun dun dun". Basically every progressive house song has that same synth. I was curious who the first person to make a song using the official progressive house synth was? Must have been a good song if it was good enough to spawn an entire genre 
Deadmau5 seems to have made it popular and mainstreamish, but I doubt he was the pioneer/inventor of that style

Deadmau5 seems to have made it popular and mainstreamish, but I doubt he was the pioneer/inventor of that style