Bastille didn't just cover Billie Eilish
They covered "Bad Guy" and inserted also sorts of songs in there - from Lady GaGa to Taylor Swift to Dick Dale
And here's an inside story
This cover was originally on their set list for the iHeart Radio theater show they did a couple of weeks ago, but they pulled it at the last second (I don't know why). So clearly it's been in the works for a minute