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I'm exasperatedly seeking the melody behind this scene in a BBC production of Samuel Beckett's Waiting for Godot, starting here at the 1:04:18 mark. It reminds me of Schubert's Der Müller und der Bach, but I think there's something else...
It is a folk melody often called Carnival of Venice when performed by classical musicians but perhaps better known as the nursery song My Hat, it Has Three Corners.
This result in google books would indicate that the same tune was used in the original production.