Sulliadm

Hey guys, I had a quick question for anyone who has an understanding in aleatoric music.

I was at a performance of Morton Feldman's Crippled Symmetry, and after talking to the performers I learned a little bit into the concept of the style. Now after some research I've hit a rut. I honestly haven't a clue where to continue looking besides what I've found so far. What I've heard so far is a couple of Morton Feldman's pieces (Crippled Symmetry and Rothko Chapel), John Cage's influence to the concept and Terry Riley's "In C". Does anyone else have any suggestions where I should continue looking?

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Don't only Practice your Art
But Force your way into it's secrets.
For it and Knowledge can raise men to the Divine.
-Ludwig van Beethoven