Turns out, there is few places where you can find great audiotracks and only mention their copy note in video description.
https://incompetech.com/music/royalty-free/music.html
https://audionautix.com/index.php
UPDATE 2019-10-21
https://www.premiumbeat.com/royalty-free-music
https://ipleer.fm/q/%D1%84%D0%BE%D0%BD%D0%BE%D0%B2%D0%B0%D1%8F+%D0%BC%D1%83%D0%B7%D1%8B%D0%BA%D0%B0+%D0%B4%D0%BB%D1%8F+%D1%81%D0%BB%D0%B0%D0%B9%D0%B4%D0%BE%D0%B2/
UPDATE 2020-04-07
https://www.bensound.com/
Update 2020-06-11
