exit music (for a film) -- OK Computer

This song feels so pre-Dark-Side-of-the-Moon Pink Floyd. It opens with early Roger Waters strumming akin to "If" on Atom Heart Mother. Organ sounds entering on 3rd verse sound like (mellotron?) choir effects. Backwards recordings enter on the next verse. We even get a Nick Mason entry along with an oh-so-good fat bass line when the song starts rocking out ala the break in Echoes prior to it's final verses. The overall arc is somewhat like that of Careful with that Axe Eugene, excepting that there is a real vocal part. The overall feel is so completely Pink Floyd from the writing to the production, to the bleak lyrics that I wonder whether it's a deliberate homage.