"But the difference, as I see it, is that art music allows greater harmonic and rhythmic intensity by virtue of not adhering to a metronomic pulse and limited harmonic progressions. The capacity for intensity increased via subtlety and complexity."
Yes ! That is exactly the conclusion I have come to - rather late in life, it has to be admitted. A pulse or beat is a simple subset of rhythm - indeed, probably the simplest possible subset. Unfortunately, because this subset is readily mappable onto visual musical notation, the illusion has persisted for hundreds of years that rhythm actually DOES involve a regular beat, that rhythm MUST be periodic and so on. In fact, I find that those rhythms most intensely musical, while exuding distinct character, are usually aperiodic or quasi-periodic functions of time.
Without going into enormous detail, my personal solution has been to evolve my own dynamic forms using improvisation - forms and "theories" (perish the word, but there's no other term) which operate within, and only within, improvisation. Reduced to its essentials, I use "cells", a cell being any general idea at all. The sound data of each cell becomes the instruction, the theoretical "rule" for the next cell. A feature, any feature, of each cell is taken as the genotype for the successive phenotype.
Rhythm, for me, is close to life itself in music, and can only live and breathe in dynamic forms, not in the static, architectural patterns of traditional forms. The Indians and the Chinese have always known this, and that is why their music is never static, but always organic and growing out of itself.
In short, all this gobbledegook I am saying is that, if you want real rhythmic fury, (any organic quality really, but you mentioned fury) then I cannot see any method except the spontaneous - i.e. improvisation.
I haven't posted any rhythmic cellular transitions in the Audition room because they're very long. I posted one split into four (it's over thirty minutes) on boxnet here:
https://public.box.net/verj83657It is from last year and neither particularly good nor particularly furious - I'm getting better at it now. It is just that, after reading your post I wondered if improvised cellular transition via rhythm might be one way you could achieve your synthesis toward the end of fury.