It's a German one, mainly one line from it:
Es ist ein unglaublich schöner Tag
(It's an unbelievably beautiful day.)
It runs through my head so often and idk it's weird. It usually pops up when I'm feeling like **** but the weather outside is genuinely nice -shrug-
[video="youtube;huBNgxolXFo"]https://www.youtube.com/watch?v=huBNgxolXFo[/video]