When watching Liberty Loves Reason the viewer is, at points of recapitulation of key ideas, bathed in a sublime Nocturne composed by Frédéric François Chopin and masterly performed by Harry Wilson. The piece is usually referred to as "Lento con gran espressione", from its tempo marking. However, it is sometimes also called Reminiscence. Perfect for moments of recapitulation in the telling of the documentary's philosophical story.