For anyone else who likes Glass's piano work, you might like some pieces by Yann Tiersen or Erik Satie.
And then go find yourself any of the multiple-piano music by the Dutch composer Simeon Ten Holt. "Canto Ostinato" is the famous one, but "Incantante IV" is probably my favorite.
> I think to this day its great background music for programming work
This article was nothing more than sponsored content for a contemporary artist who already has all of the success, publicity, and fandom he could ever need. By leveling him to a tier much closer to reality, and throwing out the names of much more accomplished and more musically-important 20th century composers, I hope to provide a counter-point to The Guardian, which is neither an authority on music nor the broader culture.
Those two are not necessarily exclusive. I enjoy some kinds of songs as background music as well as by itself. Why would I listen to background music that I wouldn't like otherwise?
> I hope to provide a counter-point to The Guardian, which is neither an authority on music nor the broader culture.
Neither are you. Or anyone else except the individual person deciding what they want to listen to.
Would your opinion of his music be any different if you were alive when it came out? He is so influential that when you listen all you hear is a tired old style, which would never exist without him.