Final answer:
John Keats wrote 'Ode to a Nightingale' in 1819, which predates the death of Percy Shelley in 1822, making the claim that Keats's poem followed his friend's death false.
Step-by-step explanation:
The assertion that John Keats wrote "Ode to a Nightingale" following the death of his friend, Percy Shelley, is false. "Ode to a Nightingale" was written in May 1819, whereas Percy Bysshe Shelley died in 1822, making it impossible for the poem to have been written as a response to Shelley's death. Keats's odes are well known for their rich imagery and exploration of themes such as nature, beauty, and mortality. "Ode to a Nightingale", in particular, is considered one of his most personal odes, wherein Keats reflects on the transient nature of human happiness and the desire for escape from the hardships of life.