Scholarly discussion of the music of John Cage.

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I am a final year honours student currently writing my dissertation on the
transition of Cage's style between the "Construction","Imaginary Landscape" 
and
"Variation" series.

I have come across "Imaginary Landscape No. 5" and am struggling to identify
the 5x5 structure within the piece. I am also wondering why Cage has opted for
a 5x5 structure in particular and if this is indeed related to his use of the
iChing?

Can anyone enlighten me?

Rachel Gillespie