Mariah Carey's 'All I Want for Christmas' is a stone-cold Christmas classic, and we'll hear NO ARGUMENT AGAINST IT.

My Chemical Romance's 'Welcome to the Black Parade', on the other hand? Not so much of a stone-cold Christmas classic.

Together, however, the emo band and the diva's songs work in a weird, strangely intriguing way thanks to the work of evil genius oneboredjeu who has created a mash-up of both songs.

It's a work of genius, if you ask us.

Hear it below: