Shelley begins the poem by describing the skylark's flight and comparing it to various natural objects. He says the bird rises "like a star of Heaven" and "like an unbodied joy," and that its flight is as swift as "a cloud of fire" and "a winged flower."
He then goes on to praise the skylark's song, saying that it is "like a poet hidden / In the light of thought" and that it "scatters songs" like "stars in the night." He says that the bird's song brings joy and inspiration to those who hear it and that it has the power to "teach us, poor mortals, flight."
Shelley ends the poem by expressing his wish to be like the skylark and to be able to soar as high as it does. He says, "Teach me half the gladness / That thy brain must know," and he imagines himself flying "far above this sphere of mortal things," where he can be free from the constraints of the world.
"To A Skylark" is a beautiful and lyrical poem that celebrates the beauty of nature and the power of music. It is a testament to Shelley's skill as a poet and his deep appreciation for the natural world.