Thanks for introducing me to the song "Day After Day". It's very Floyd-ish.

The lyrics are definitely sad and full of regret:

  Gaze at the sky
  And picture a memory
  Of days in your life
  You knew what it meant to be happy and free
  With time on your side

  Remember your daddy
  When no one was wiser
  Your ma used to say
  That you would go further than he ever could
  With time on your side

  Think of a boy with the stars in his eye
  Longing to reach them but frightened to try
  Sadly, you'd say, someday, someday

  But day after day
  The show must go on
  And time slipped away
  Before you could build any castles in spain
  The chance had gone by

  With nothing to say
  And no one to say it to

  Nothing has changed
  You've still got it all to do
  Surely you know
  The chance has gone by

  Think of a boy with the stars in his eye
  Longing to reach them but frightened to try
  Sadly, you'd say, someday, someday

  But, day after day
  The show must go on
  And you gaze at the sky
  And picture a memory of days in your life
  With time on your side

  With time on your side
  (day after day the show must go on)
  With time on your side
  (day after day the show must go on)