This sound is a small fragment of "One Man Rumba" binaural musical recording example uploaded by Karl Binaural Audio (<a href="http://www.kallbinauralaudio.com)" rel="nofollow">http://www.kallbinauralaudio.com)</a> Binaural Recording - Wikipedia page (<a href="https://en.wikipedia.org/wiki/Binaural_recording)." rel="nofollow">https://en.wikipedia.org/wiki/Binaural_recording).</a> I convert the original sound to mono using Audacity application. Furthermore, I take the small portion (exactly 5 second length) from the original sound (from 26.5s to 31.5s) and give fade-out effect from 31.1s to 31.5s.