Tegan and Sara, aka Tegan & Sara, have recorded the theme tune to a new advert for Oreo cookies.
Cookies are like biscuits, but they come from overseas.
The advert — which features the jingle, 'Wonderfilled' — will 'premiere' at some point during the Grammys and marks the launch of the new Cookie Dough and Marshmallow Crispy Oreo Cookies.
According to Billboard, the jingle wasn't written by Tegan or Sara but by a team of copywriters inspired by their music.
It's pretty good actually.