The poet saw a scotish girl absolutly alone in the field reaping and binding the crops . she was singing a so melodious song that poet thinks that she is singing well than a nightingale or a cuckoo bird. however poet was not able to identify what she was singing because she was singing in her mother tong (scotish laqnguage) . from the music he identified that it was a sad song . as poet continued his journey after sometime music stop to be heard . but then also it remained safe in poet's mind and heart .