Electro-pop song where in the MusicVideo everyone gets killed on the dancefloor?
 

Hi, I'm looking for a song where in the music video, at the end, everyone, or the artist gets killed on the dancefloor, I think there was a lot of blood on a checkboard floor, she may have had red hair, and the song started with a piano, that almost reminded me of a more modern/electro version of piano they might play in churches :laughing: I think the singer is english...
Please help :)