Mine was "Power Windows" by Rush.
I had purchased it and Simple Minds' "Once Upon A Time", but I listened to Rush first. I was blown away by the fact that where there was no music, there was the most profound, utter silence. I imagined that it was silent like in a vacuum, like in outer space. I had an excellent pair of Sennheiser headphones and I thought it was the coolest thing I had ever heard, that silence.
The CD is 25 years old.
Tell me what you listened to first.