Poetry is a great way to become familiar with a language. It is rooted in the way the words sound, the way they are put together. They often paint a picture like this one does. Imagine that you are out in the middle of the woods alone, on your horse. How do you feel.
The first time you listen to the poem, just listen to the sounds. Don't worry about the meaning. Then listen to it again and read along. Make a note of the words you don't know.