Interconnectedness is a musical piece released by 3301 during the 2014 puzzle. More information can be found here.
The starting and ending cicada sounds was identified to be from this source: https://commons.wikimedia.org/wiki/File:A_Magicicada_chorus_containing_M._septendecim,_M._cassini,_and_M._septendecula_-_pone.0000892.s004.oga
Comparison of 'Interconnectedness' and the reference cicada sounds spectrograms (starting sound).
Comparison of 'Interconnectedness' and the reference cicada sounds spectrograms (ending sound).