Wikimedia Commons
Trillion Catz - 02 - Emptiness ft Sasha Vinogradova
Trillion Catz · 4:19
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Trillion Catz / CC BY 4.0 (https://creativecommons.org/licenses/by/4.0), via Wikimedia Commons - https://commons.wikimedia.org/wiki/File:Trillion_Catz_-_02_-_Emptiness_ft_Sasha_Vinogradova.ogg
Where to put it: Reasonable to the medium: video description or credits.