This quote effectively foreshadows his behaviour later on in the novel. Initially he is content as his slave, Lucky is weeping beneath him, and actually laughs. However, once Lucky stops weeping, Pozzo realizes he's lost his pipe, and begins to get upset. This shows his emotionally unstable character.

 

The stark contrast between these two songs evidently depicts the theme of everchanging emotions. The tone depicted in Ferells "Happy" is a fast-paced and upbeat one that depicts a pleasurable and joyful experience. In Mad Love, on the other hand, the solemn and saddening tone in Mad Love depicts a depressing thought of mind. 

 

This effectively relates the two, in that the stark change of tone and emotion in both Waiting for Godot and in the two songs listed above show emotional dilemmas and issues that individuals face depending on their state of mind.