Philip Glass is so amazing. He is one of my favorite composers. Among his film socres, my favorites are The Hours, The Truman Show, and of course Koyaanisquatsi.
Einstein on the Beach and 1000 Airplanes on the roof are really amazing as well.
I highly recommend his String Quartets at well. I recently picked up the Kronos Quartet preforming his quartets and they are some really interesting pieces.
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