There is a song in Kingdom Hearts 3D that plays during cutscenes, usually when one of the villains is explaining a mind screw concept to one of the protagonists. Particularly you can hear it at this point in the game (at the 1:41:43 part of the video) where Sora is on The Grid and Xemnas describes the digital nature of The Grid, and that Ansem the Wise used a copy of its data for his operating system at the Radiant Garden. I can't find it anywhere in the soundtrack on youtube, and my google search has been turning up blank as well. Can anyone name this song?
Your sample starts about 40 seconds in and is at a low volume, but the song is The Nightmare. It's song number 3 on disk 2 of the soundtrack.