What Is the Most Soothing Sound?

Indeed what is...
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Sources:
(1) www.sciencedirect.com/science/article/pii/S1474442…
(2) noisyworld.org/marpac-dohm-vs-lectrofan/
(3) www.nytimes.com/2018/12/27/style/white-noise-machi…
(4) www.self.com/story/brown-noise-adhd
(5) www.tinnitusjournal.com/articles/effects-of-tinnit…
(6) www.proquest.com/docview/2427969874?pq-origsite=pr…
(7) www.self.com/story/brown-noise-adhd
(8) www.nytimes.com/2018/12/27/style/white-noise-machi…
(9) www.bbc.co.uk/bitesize/articles/zpwkr2p
(10) www.bootshearingcare.com/great-british-sounds/
(11) today.yougov.com/topics/society/articles-reports/2…
(12) www.forbes.com/sites/jordanpassman/2016/11/23/the-…
(13) railroads.dot.gov/highway-rail-crossing-and-trespa…
(14)    • Train Horns: Train Talk Ep. 5  

Music in Order of Appearance:

Hiraeth – Scott Buckley
Kalmiba – Canon Cover
Mild Seven -- Luxury Elite
Autechre – si00
Kevin MacLeod – Style Funk
Broken Bottles OST – midnight_90BPM

Songs Mentioned:

Marconi Union - Weightless
   • Marconi Union - Weightless (Official ...  
Aphex Twin - Rhubarb
   • Aphex Twin - Rhubarb  
Aphex Twin - Stone In Focus
   • Aphex Twin - Stone In Focus  
Boards of Canada - Echus
   • Boards of Canada- Echus