Shelley, a fierce critic of political and religious oppression, dreams that the revolutionary spirit of John Milton rises and takes a lute from the tree of life—a heavenly instrument. When Milton plays, the result isn’t melody but ‘sweet thunder,’ a sound that physically shakes all human structures raised in contempt of mankind: bloodstained thrones, unholy altars, prisons, and fortresses. The speaker feels an electrified hope, a thrill at seeing art become a cleansing storm. The mood is prophetic and charged with imminent upheaval. Because the lute is plucked from a living tree, the music feels organic and unstoppable, like a force of nature. The fragment cuts off in mid-quake, so the rebellion seems still in motion—as if the reader has only caught the first tremor.
Fragment: Milton's Spirit — Summary
I dreamed that Milton's spirit rose, and took From life's green tree his Uranian lute; And from his touch sweet thunder flowed, and shook All human things built in contempt of man,-- And sanguine thrones and impious altars quaked, Prisons and citadels...