I've seen the golden section applied to art, but does it apply to sound/timing as well? Just curious.
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Almost certainly not, seeing as the golden ratio has almost nothing to do with (classical) art and architecture anyway. See for example this review in the Notices. 


Here's a page on its relation to music: http://www.maths.surrey.ac.uk/hostedsites/R.Knott/Fibonacci/fibInArt.html#music 


My guess this is not an appropriate question for MO, but being weekend and all... I have heard of one approach to memorization which consists in repeating something in time intervals corresponding to the Fibonacci sequence. I did not find a reference, so take this with a grain of salt, though :) 


I believe so Debussy and apparently others used the Fibonacci sequence in his work. See here for more information and references. Especially see the following: Roy Howat (1983). Debussy in Proportion: A Musical Analysis. Cambridge University Press. ISBN 0521311454. There is a preview of this book on Google books. 

