Black Butler opening 1, Monochrome no Kiss/Monokuro no Kiss.
Because I’m totally biased and s1 of Black Butler is my all time favorite anime and
I’m still biased and have learned the lyrics in English, Japanese, on piano, and on clarinet (I can play clarinet, no I am not squidward).
It’s just one of my favorites of all time and you can’t change my mind on this.