The ostinatos are more ominous. The slow chords hang in the air like wraiths. The one which sounds coolest, to my ears, is the Babylon 5 theme, which is just majestic and echoes through your mind with the thought of our last, best hope for peace. But the Doctor Who theme sounds like alien monks chanting their slow Gregorian observations — plus you can totally hear how Delia Derbyshire made one of the earliest pieces of electronic music by pasting together bits of tape by hand.