/jp/ - Otaku Culture

Can someone help me out? I'm looking for a certain song i thought i'd ask /r and /a but the couldn't help now im here at /jp. so the song im looking for imgoing off memory so it may be vague to the max. I can't remember if it was an opening or ending theme for an anime or even if it was just a amv. It had piano, a female singer, the song had a video of a chick on a broom can't remember if she had a witches hat or not. and slihtly remember they can fly in this. it had a really long name in the song and i think it was 4 minutes long. Does anyone know what song that is?

Thanks anons