here are some example sources of those three:
http://www.philipglass.com/ <- check out the "music" tab and then click the "listen/watch" button and choose "The Hours" or any of the "Etudes for Piano"
http://www.philipglass.com/audioplayer/audioplayer.html <- this might take you directly to the "Listen/watch" page
http://www.youtube.com/watch?v=vnnvSh0WCkY <- one Eno song with the right sort of sound except without the voice and electric guitar parts
http://www.youtube.com/watch?v=VFNFDPpkTJs <- another Eno song with more of the happy-sneaky feel I was thinking of from Mancini
http://www.henrymancini.com/ <- check out the "his music" tab after the intro then "music samples" and maybe try "Soldier in the Rain" or "Main Theme (of Touch of Evil)" ... he did the Pink Panther theme for an example you are likely well aware of and the music for the Great Mouse Detective