I've been watching Eastenders on and off for about twenty years, and never before have I noticed that the theme tune incorporates Grease's 'Summer Nights'.
Listen solely to the bass sound of the theme: http://www.youtube.com/watch?v=cZYa_KfLTtM
Listen solely to the bass sound of the theme: http://www.youtube.com/watch?v=cZYa_KfLTtM