In 1819, John Keats composed six odes, which are among his most famous and well-regarded poems. Keats wrote the first five poems, "Ode on a Grecian Urn", "Ode on Indolence", "Ode on Melancholy", "Ode to a Nightingale", and "Ode to Psyche" in quick succession during the spring, and he composed "To Autumn" in September. While the exact order in which Keats composed the poems is unknown, some critics contend that they form a thematic whole if arranged in sequence. As a whole, the odes represent Keats's attempt to create a new type of short lyrical poem, which influenced later generations.