"The Witch of Atlas is a major poetic work of the English romantic poet Percy Bysshe Shelley written in 1820 and published posthumously in 1824 in the Posthumous Poems collection. The poem was written in 78 ottava rima stanzas during the period when Prometheus Unbound and The Cloud were written and reflects similar themes. The theme of the poem is a quest for the perfect union. British composer Sir Granville Bantock wrote a tone poem for orchestra based on the Shelley poem in 1902, The Witch of Atlas: Tone Poem for Orchestra No.5 after Shelley, which was first performed on 10 September 1902.".