In The Solitary Reaper, what makes the maiden's song extraordinary is that it never seems to die; it is eternal in nature and universal in its beauty.
Whate'er the theme, the Maiden sang / As if her song could have no ending;
The maiden's song so entrances the poet that he maintains
A voice so thrilling ne'er was heard; In spring-time from the Cuckoo-bird...
The poet pleads for someone to tell him what the maiden is singing about. He imagines that her songs are about old, unhappy incidents, or perhaps, even about ancient battles. He surmises that the topics of her songs may be more mundane than anyone suspects and that they concern themselves with the common human experiences of 'natural sorrow, loss, or pain.' In the end, the poet concludes that it doesn't really matter what she is singing about, as he will always bear her extraordinary music in his heart even when he cannot hear it anymore.