I love both Orbital and Zola Jesus. More people should investigate both artists' work.
Don't listen to Zola Jesus, but her vocals in this song are topnotch. Phil and Paul Hartnoll had the right idea when they felt that the track originally was lacking something.
God, those vocals. Euphoria.
Hydraulic Dogs remix here: http://www.youtube.com/watch?v=h6a3INKDf6w