Stumbled across a wonderful article written at the UCLA school of Music of Ethnomusicology on the shakuhachi.
Beyond the historical context and just the fact that it is something about shakuhachi (automatically gets my interest), what I found most interesting was the parallelism between music/noise vs non-spiritual/spiritual.
In my humble opinion, the perceived divide is a delusion and a distinction that creates the Gap.
“If there is a thousandth or a hundredth of a gap, heaven and earth are far apart.” ~ Dogen
http://ethnomusicologyreview.ucla.edu/journal/volume/17/piece/585