Lyrics:

[Backwards message:] 'Congratulations, You have just discovered the secret message. Please send your answer to 'Old Pink,' Care of the funny farm, Chalfont...' - Roger Waters
'Roger, Caroline's on the phone...' - Unknown Voice
What shall we use
To fill the empty spaces
Where we used to talk?
How should I fill
The final places?
How should I complete the wall?