The Mellotron Group

Strange Advance - Worlds Away.  Sounds like Bowie with gobs of 4-Track Mellotron.  The tremolo strings are probably real strings on the studio recording.  Live, they used the 4-Track with a tremolo effect.  (and gobs of dry ice fog and blue lights).  Goosebump city.  
http://www.youtube.com/watch?v=yEDw2P4Yjx0