Scholarly discussion of the music of John Cage.

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Hi, I am currently writing my undergraduate dissertation on Cage, and have 
come
accross an issue which I can't seem to find much information on.

I am currently investigating the indeterminate aspects in Variations IV. I 
have
found in an article that chance procedures were used in the composing of the
Variations scores, but I can't find anymore on this. Most of the information 
is
on the indeterminate aspects of the realisation and performance, and does not
mention Cage's compositional process.

I wondered if anyone could shed any light on this?

Many thanks,
Claire Harris
Edinburgh Napier University