TOYSTORY3.EXE - OST - Rex Boss
This music plays as you are chased down by Rex in TOYSTORY3.EXE.
This song is all original, not taken from anywhere else. The thing that makes me satisfied about this song are the toms in the percussion. They make an intense feeling as you're chased by Rex. The minor seconds (A.K.A. those horrible notes) laid throughout the song are there to create tension.