It is said that Coleridge's greatest achievement was William Wordsworth. There is some truth to this. But he was also a great poet in his own right. In Lyrical Ballads he and Wordsworth changed English sensibilities (and American) completely. While Wordsworth was the greater poet, Coleridge was the greater philosopher. It is Coleridge's insights as a critic which encapsulates English Romanticism.
In this poem published in 1798, he not only conveys a new style of sensualness but also critiques the literarati before him. It is a truly Literary poem in that it is very aware of the literature that came prior.
The Nightingale opens with Colerdge painting a picture of a nighttime scene with friends. They sit on a "mossy bridge," where they will think on nature. Then, almost on cue, "the Nightingale begins its song." This bird causes him to reflect on the writers of yore. Men who wrote that the nightingale's song was a melancholy one. To which Coleridge replies "A melancholy bird? Oh idle thought!"
He goes on to convey a completely different way to approach our experience of knowledge, learning, nature and literature.
If you have ever wanted to truly experience the grandeur of nature and man in nature, this is a good poem to get you started.