I went for quite a while wondering which of my favourite albums had a significant input from the flute, when it was obvious all along.
Glass is a contemporary composer known for minimalism - pared down, repetitive stuff, the classical version of ambient, maybe. This album is designed to be accessible, and I think it’s a great intro to this kind of music.
I guess you could call it a chamber orchestra, but it sounds nothing like it. After the beautiful piano opener the synth dominates the rhythm, while the orchestra, and notably the flute, play repetitive riffs.
If you like this, there is a wealth of similar stuff available. The film Koyaanisqatsi has fairly similar music (plus spectacular bass on the opening track, only sub-20 systems need apply…), and Aguas das Amazonias is beautifully repetitive. He’s also written stuff in more classical form.
Note that the album is just six tracks, ending in “Closing” - ignore the stuff added on in the extended versions for now.