Tone of "Ode on a Grecian Urn"

The tone of this poem is the peace and happiness that surrounds a grecian urn. "Heard melodies are sweet, but those unheard are sweeter;" (lines 11-12) These lines show how even though music may not be heard it is still there, and leaves the atmosphere serene and cheerful. Peacefulness is represented by the urn and how it sits quietly and mysteriously, unable to leave. The speaker talks about how happy the trees are and that they seem to never age. Everything is so beautiful and peaceful and to take it all in can leave one feeling too full. "happy , happy boughs!that cannot shed your leaves...happy melodist, unwearied for ever piping songs...For ever panting, and for ever young...That leaves a heart high-sorrowful and cloy'd," (lines21-29) Even though the person who the urn holds cannot experience this atmosphere, the people who mourn can. "Beauty is truth, truth is beauty," (line 49) The diction of the poem is formal because the speaker talks in a language that was common in that era. It makes the poem seem almost like a hymn you would sing in church.