'Ode to a Nightingale' is a poem written by John Keats that explores themes of nature, beauty, mortality, and the fleeting nature of happiness. This work is a quintessential example of Romantic poetry, emphasizing the emotional experience and the deep connection between the human spirit and the natural world, encapsulated in the song of the nightingale, which symbolizes transcendent beauty and art that contrasts with human suffering and impermanence.