It’s the theme for the final boss of Mother Russia Bleeds, “Fixions” is the autor and he did one of those awesome musics. If you don’t want to be spoiled (if you haven’t finished the game yet if you have it) don’t click, or if you don’t care you can listen.
Personally, I love it. But because it’s made to do a loop, it stops suddenly. There’s an option on Youtube that allows you to repeat the video automatically. Just right click the video and chose the option (if you want).