Need a little help to identify an obscure music video?

I saw a music video at Bally's where a girl was like a silhouette, she's running through the forest or woods. There's some animated stuff going on with dancing skeletons or skulls. I think there may be bits where she's playing the piano & standing over a grave. The song had an interesting beat that really hooked me in, sorry but that's all I got. Thanks in advance! ...& BTW: It's not Avril Lavigne