[Powerslave]

The best Glass album for AM's playlist would probably be "1000 Airplanes on the Roof." It's very representative of his works in the 80's and early 90's--not repetitive, shorter songs (the longest track might be 5 minutes), varying styles and I think a few vocals thrown in at certain places (Linda Ronstadt was a guest artist on the recording).

Another one that might fit would be "Passages," an album he wrote and performed with Ravi Shankar. It's not so much prog as world music, but would make a great addition to a personal collection if it doesn't quite fit here.