There were in fact two tunes that were played in the Cornfield scene, the first was:

Junkie XL feat. Infusion - "Nightmares"

however there was another tune mid way through the scene, just before Gibb went into the cornfield (when she was followed by the bloke with the illuminous sticks) & got mullered. It can be heard only for three seconds or so.
So far NO ONE has found out what this song was - probably due to it being a generic EDM song extended to sound similar to the licensed Junkie XL song. Another probability is that it is a remix of the Junkie XL song. Does anyone know what this is?