 The nightingale 's song within the poem is connected to the art of music in a way that the urn in " Ode on a Grecian Urn " is connected to the art of sculpture . As such , the nightingale would represent an <unk> presence and , unlike the urn , is directly connected to nature . As natural music , the song is for beauty and lacks a message of truth . Keats follows Coleridge 's belief , as found in " The Nightingale " , in separating from the world by losing himself in the bird 's song . Although Keats favours a female nightingale over Coleridge 's masculine bird , both reject the traditional depiction of the nightingale as related to the tragedy of <unk> . Their <unk> is a happy nightingale that lacks the melancholic feel of previous poetic depictions . The bird is only a voice within the poem , but it is a voice that <unk> the narrator to join with in and forget the <unk> of the world . However , there is tension in that the narrator holds Keats 's guilt regarding the death of Tom Keats , his brother . The song 's conclusion represents the result of trying to escape into the realm of fancy . 
