So my Yoga App seems to buy tracks from a stockmusicsite (like stock-pictures but for music) because their song from today:
https://www.youtube.com/watch?v=poeSq8CT2aA
appears there
https://www.stockmusicsite.com/stockmusic/summary/play.cfm/crumb.1/crumc.0/sound_iid.436071
and now I suppose one buys whole collections like "everything with the Mood 'calm' and the keyword 'Atmospheric' for one's films, apps or TV shows.
Interesting.