[microsound] Pieces that play & "listen"

[Norbert Herber]

Hello microsounders,

I'm looking for titles of pieces that are algorithmic, generative,  
procedural, etc. and also "listen." Has anyone made a piece that  
procedurally incorporates what has previously been played into what it  
is currently playing or about to play? Technically and conceptually I  
can think of many reasons this has already been done but I can't  
recall hearing (or hearing about) such a work.

Thank you for your suggestions. ::Norbert