iannis xenakis brings out more about the idea of 'formalized' composition. "the collision of hail or rain with hard surfaces, or the song of cicadas in a summer field. these sonic events are made out of thousands of isolated sounds; this multitude of sounds, seen as totality, is a new sonic event." xenakis in 'formalized music: thought and mathematics in composition.' he combined ideas from architecture, music, math, and natural phenomenon.
here's another article:
www.culture.pl/en/culture/artykuly/es_lutoslawski.htmlformalized music to lutoslawski seems to be in the idea of isolating rhythm and making it more of a variable (not specifying the durations or lining music up horizontally) - and yet the pitch and harmony are specified. also, he shows how you can play aleatory music 'ad libitum' or in time (just as with certain classical pieces).
i haven't read all of the articles, but i personally think what ties bach and lutoslawski together is the idea of 'formalized' composition. it is thought out - and yet sounds 'random' at times. even bach did some way out of the ordinary stuff with his preludes and fugues. maybe it is an attempt to teach us how to percieve sound on a deeper level. with bach, when you listen to glen gould, you can start hearing things that you never heard before because he is paying attention not just to the 'melodic line' but the overall scheme. a sort of working out of a plot. many characters (or ideas) just as with the 'bundle' idea of lutoslawski. to hear the elements in the bundle - you have to really listen and know what to look for probably. maybe listening to the pieces he composed several times - and each time saying 'ooh, look, i heard something new.' this is always the case with bach as well.
one thing i am very confused about right now is the idea of 'climax.' with bach, it seems that the climax is at the end of the prelude - but sometimes in the middle of a fugue (is that right?). now, how does lutoslawski percieve climax. are they always in the middle of his pieces or does each individual listener determine where the climax actually is? is this what is so confusing about his work?